2AWJK-WMT-C1Wireless Presentation System

Grastron Technology CO., LTD

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Application Details

Equipment Class: NII - Unlicensed National Information Infrastructure TX
Date of Grant: Feb 02, 2021
Application Purpose: Original Equipment
Date of Application: Feb 02, 2021
Equipment Note: Wireless Presentation System
Frequency Range: 5745.00000000 - 5825.00000000
Company: Grastron Technology CO., LTD
Country: China

Documents & Files

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Document Text

Text extracted from the exhibit documents filed with the FCC. Open a document above to read the original.

Users Manual

1 / 107 Wireless AV Content Sharing & BYOD collaboration System (Quad Viewer) User Manual_V1.6 Receiver: WMS-10, WMS-20, WMS-40 Transmitter: WMT2-C, WMT-Mini, WMT3-H, WMT-C1 Model NO.:WMT-C1 2 / 107 Feature List: WMS-10/WMS-20/WMS-40: Support quad viewer on one display. Support VESA PC resolution input, auto-detecting. Can transmit PC’s mirror/extended desktop or Macbook's mirror desktop. Can transmit smart devices' mirror, photos, videos, music etc. Support the Wireless Media Teleporter "show-me" button. Support USB/HDMI/USB Type C plug-in auto configuration/pairing for Wireless Media Teleporter "show-me" button. Support "Airplay" for apple device. WMT2-C/WMT-Mini/WMT3-H/WMT-C1: Support VESA PC resolution, auto-detecting. Can wireless transmit PC's mirror or extended desktop to base unit. Quick "Show-me" button to selection switcher the active signal of PC, less than 1s. "Show-me" button can independently step in/out the source of PC. Dual color LED, green indicates active source signal, red indicates power/link. (Hardware support on USB dongle, HDMI dongle and Type C dongle) Version log: Version Revise time Description 1.0 2019, NOV. 21 th Created 1.5 2020, MAR.13 th Updated Catalogue 1.Overview:................................................................................................................................................... 6 2.Specification: ............................................................................................................................................. 8 3.Panel Layout ............................................................................................................................................. 8 3.1 Hardware Interface ..................................................................................................................... 9 3.1.1 WMS-10/WMS-20/WMS-40 Front Panel ................................................................................. 9 3.1.2 WMS-10/WMS-20/WMS-40 Rear Panel ................................................................................. 11 3.1.3 Factory Reset ............................................................................................................................ 12 3.1.4 Dongle Front Panel .................................................................................................................. 14 3.2 Software Interface .................................................................................................................... 18 3.2.1 Home Screen ............................................................................................................................ 18 4. Installation .............................................................................................................................................. 20 4.1 Installation methods for the Base unit .................................................................................... 20 4.2 Wiring Diagram ........................................................................................................................ 21 4.3 Power Connection .................................................................................................................... 22 4.4 Video Connection .................................................................................................................... 22 4.5 Audio Connection .................................................................................................................... 23 4.6 LAN connection ........................................................................................................................ 25 4.7 Usage of USB device ................................................................................................................ 27 5. Quick-to-Start ......................................................................................................................................... 28 5.1 Mobile device: Wireless Connection ....................................................................................... 28 5.1.1 Enable portable hotspot:............................................................................................................... 29 5.1.2 Enable LAN connection: ........................................................................................................... 29 5.2 Pairing transmitter with base unit ........................................................................................... 30 5.3 Mirroring ................................................................................................................................... 32 5.3.1 PC/Lap-top ............................................................................................................................... 32 5.3.2 Mobiles Devices ....................................................................................................................... 35 5.4 Preview Window ....................................................................................................................... 39 5.5 Whiteboard & Annotation ....................................................................................................... 40 5.5.1 Whiteboard ................................................................................................................................. 41 5.5.2 Annotation .................................................................................................................................. 43 3 / 107 4 / 107 6. Web Setting Management Configuration ............................................................................................ 45 6.1 Network settings ...................................................................................................................... 48 6.1.1 Wireless network ...................................................................................................................... 48 6.1.2 Ethernet .......…

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Cover Letter(s)

FCCSoftwareConfigurationControlDeclarationRev1.1 GrastronTechnologyCO.,LTD FCCSoftwareConfigurationControlDeclaration Date:January28,2021 FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USA Attn:OETDept. Product/ModelNumber:WirelessPresentationSystem/WMT-C1,WMT-C10,WMT- C11,WMT-C12,WMT-C13,WMT-C14,WMT-C15,WMT-C16,WMT-C17,WMT-C18, WMT-C19,WMT-C1X RegardingFCCCountryCodeSelectionguidelinesidentifiedinKDB594280v02r01. “Allapplicationsforequipmentauthorizationfortransmittersthatcanhaveradio parameters,orothertechnicalparameters,reportedtotheCommissionsetbysoftware musthaveanattestationindicatingthatnothirdpartywillhavesoftware,orconfiguration control,toprogramthedeviceoutofcomplianceofthetechnicalrulesunderwhichithas beencertified.” Wedeclarethatnothirdpartywillhavesoftware,orconfigurationcontrol,toprogramthedevice outofcomplianceofthetechnicalrulesunderwhichithasbeencertified. Name:HaohangHouDate:28/01/2021 Title:GeneralManager Signatureofapplicant

Cover Letter(s)

GrastronTechnologyCO.,LTD DeclarationonModelDifferences We, GrastronTechnologyCO.,LTD 4ABuildingNO.B,DingxinScienceandTechnologyPark,HonglangbeiNO.2Road,Xin'an street,Baoandistrict,Shenzhen,China Declarethatthefollowingproduct(s): ProductName:WirelessPresentationSystem ModelNo.:WMT-C1,WMT-C10,WMT-C11,WMT-C12,WMT-C13,WMT-C14,WMT-C15, WMT-C16,WMT-C17,WMT-C18,WMT-C19,WMT-C1X FCCID:2AWJK-WMT-C1 Utilizetheidenticalcircuitdesign,PCBlayout,shieldingandinterfacewith(WMT-C1),only thesameexceptthecolorandsoftwarefunction(butdoesnotaffectthestructure,electronic circuit,theRFandEMCparameters)different.Thereforethisapplicationcanberegardedas identicalinperformancetothesubmittedtestsample. Themanufacturerwouldtakealltheresponsibilitiesfortheaboveproduct(s). Forandonbehalfof ShenZhen,China AuthorizedpersonLocation Name:HaohangHou Position:GeneralManager Dateofissue:2021-01-28 *IherebydeclarethatIamentitledtosignonbehalfoftheapplicantandthattheinformationsuppliediscorrectandcomplete.

Cover Letter(s)

GrastronTechnologyCO.,LTD OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USA Date:2021/01/28 Subject;RequestforConfidentiality FCCID:2AWJK-WMT-C1 ToWhomItMayConcern, PursuanttotheprovisionsoftheCommission’srulesTitle47Sections§0.457and§0.459,we arerequestingtheCommissiontowithholdthefollowingattachment(s)asconfidential documentsfrompublicdisclosureindefinitely. Thesedocumentscontaindetailedsystemandequipmentdescriptionsandareconsideredas proprietaryinformationinoperationoftheequipment.Thepublicdisclosureofthesedocuments mightbeharmfultoourcompanyandwouldgivecompetitorsanunfairadvantageinthemarket. SchematicDiagram BlockDiagram OperationalDescription FCCSWSECURITYDESCRIPTION Inadditionaltoabovementioneddocuments,inordertocomplywiththemarketingregulations inTitle47CFR§2.803andtheimportationrulesinTitle47CFR§2.1204,whileensuringthat businesssensitiveinformationremainsconfidentialuntiltheactualmarketingofnewly authorizeddevices,werequestShortTermConfidentialityofthefollowingattachment(s); ExternalPhotos TestSetupPhotos InternalPhotos UserManual For45days,pursuanttoPublicNoticeDA04-1705. OR For180dayspursuanttoKDB726920D01. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondenceduringthecertificationreviewprocesscannotbegrantedasconfidential documentsandthisinformationwillbeavailableforpublicreviewoncethegrantofequipment authorizationisissued. Sincerely, Signature: Name:HaohangHou Title:GeneralManager

Cover Letter(s)

GrastronTechnologyCO.,LTD LetterofAuthorization Company:GrastronTechnologyCO.,LTD Address:4ABuildingNO.B,DingxinScienceandTechnologyPark, HonglangbeiNO.2Road,Xin'anstreet,Baoandistrict,Shenzhen,China ProductName:WirelessPresentationSystem ModelNumber(s):WMT-C1,WMT-C10,WMT-C11,WMT-C12,WMT-C13,WMT- C14,WMT-C15,WMT-C16,WMT-C17,WMT-C18,WMT-C19,WMT-C1X ProductDescription:WirelessPresentationSystem WeauthorizeMiCOMLabsInc.,575BoulderCourt,Pleasanton,California94566,USA, toactonourbehalfonallmattersconcerningthecertificationofabovenamed equipment. WedeclarethatMiCOMLabsInc.isallowedtoforwardallinformationrelatedtothe approvalandcertificationofequipmenttotheregulatoryagenciesasrequiredandto discussanyissuesconcerningtheapprovalapplication.Anyandallactscarriedoutby MiCOMLabsonourbehalfshallhavethesameeffectasactsofourown. Signature:Date:28/01/2021 Name:HaohangHou Title:GeneralManager Company:GrastronTechnologyCO.,LTD

External Photos

FCCID:2AWJK-WMT-C1

ID Label/Location Info

LabelLocation:

ID Label/Location Info

ProductName:WirelessPresentationSystem ModelNo.:WMT-C1 FCCID:2AWJK-WMT-C1 ThisdevicecomplieswithPart15oftheFCCRules.Operation issubjecttothefollowingtwoconditions: (1)Thisdevicemaynotcauseharmfulinterference,and (2)Thisdevicemustacceptanyinterferencereceived,including interferencethatmaycauseundesiredoperation.

Internal Photos

FCCID:2AWJK-WMT-C1 WIFIAntennaAWIFIAntennaB

RF Exposure Info

RFEXPOSUREEVALUATION AccordingtoFCC1.1310:Thecriterialistedinthefollowingtableshallbeusedto evaluatetheenvironmentimpactofhumanexposuretoradiofrequency(RF)Radiation asspecifiedin§1.1307(b) FCCID:2AWJK-WMT-C1 EUTSpecification EUTWirelessPresentationSystem Frequencyband(Operating)WLAN:2.412GHz~2.462GHz WLAN:5.18GHz~5.24GHz WLAN:5.745GHz~5.825GHz Others:2.402GHz~2.480GHz DevicecategoryPortable(<20cmseparation) Mobile(>20cmseparation) Others___ ExposureclassificationOccupational/Controlledexposure(S=5mW/cm2) GeneralPopulation/Uncontrolledexposure(S=1mW/cm2) AntennadiversitySingleantenna Multipleantennas Txdiversity Rxdiversity Tx/Rxdiversity Max.outputpower2.4GWiFi:15.57dBm(0.036W) 5.1GWiFi:14.71dBm(0.296W) 5.8GWiFi:14.00dBm(0.025W) Antennagain(Max)WiFi2.4G:ANTA&ANTB3.81dBi WiFi5.1G&WiFi5.8G:ANTA&ANTB2.65dBi EvaluationappliedMPEEvaluation SAREvaluation LimitsforMaximumPermissibleExposure(MPE) Frequency Range(MHz) ElectricField Strength(V/m) MagneticField Strength(A/m) Power Density(mW/cm 2 ) Average Time (A)LimitsforOccupational/ControlExposures 300-1500----F/3006 1500-100000----56 (B)LimitsforGeneralPopulation/UncontrolExposures 300-1500----F/15006 1500-100000----130 Friistransmissionformula:Pd=(Pout*G)\(4*pi*R2) Where Pd=PowerdensityinmW/cm 2 Pout=outputpowertoantennainMw G=gainofantennainlinearscale Pi=3.1416 R=distancebetweenobservationpointandcenteroftheradiatorincm PdthelimitofMPE,1mW/cm2.Ifweknowthemaximumgainoftheantennaand totalpowerinputtotheantenna,throughthecalculation,wewillknowthedistance wheretheMPElimitisreached. MeasurementResult 2.4GWiFiANTA: Operating Mode Channel Frequency (MHz) Measured Power (dBm) Tuneup tolerance (dBm) Max.Tune upPower (dBm) Antenna Gain (dBi) Powerdensity at20cm (mW/cm 2 ) Powerdensity Limits (mW/cm 2 ) 802.11b 241213.4613.46±114.463.810.01341 243711.9211.92±112.923.810.00941 24629.689.68±110.683.810.00561 802.11g 241212.912.9±113.93.810.01171 243712.1312.13±113.133.810.00981 246213.1113.11±114.113.810.01231 802.11n (HT20) 241212.1412.14±113.143.810.00991 243713.0113.01±114.013.810.01201 246213.2113.21±114.213.810.01261 802.11n (HT40) 242213.6113.61±114.613.81 0.0138 1 243712.1612.16±113.163.810.00991 245213.9513.95±114.953.810.01501 2.4GWiFiANTB: Operating Mode Channel Frequency (MHz) Measured Power (dBm) Tuneup tolerance (dBm) Max.Tune upPower (dBm) Antenna Gain (dBi) Powerdensity at20cm (mW/cm 2 ) Powerdensity Limits (mW/cm 2 ) 802.11b 241211.4311.43±112.433.810.00841 243710.7610.76±111.763.810.00721 246211.6211.62±112.623.810.00871 802.11g 241211.7511.75±112.753.810.00901 243710.1710.17±111.173.810.00631 246210.1210.12±111.123.810.00621 802.11n (HT20) 241210.9710.97±111.973.810.00751 243711.0411.04±112.043.810.00771 246210.3810.38±111.383.810.00661 802.11n (HT40) 242210.8910.89±111.893.81 0.0074 1 243710.9910.99±111.993.810.00761 245210.4510.45±111.453.810.00671 ANTA+ANTB Operating Mode Channel Frequency (MHz) ANTA Powerdensityat20cm (mW/cm 2 ) ANTB Powerdensityat20cm (mW/cm 2 ) ANTA+ANTB Powerdensityat 20cm (mW/cm 2 ) Powerdensity Limits (mW/cm 2 ) 802.11b 24120.01340.00840.04341 24370.00940.00720.03311 24620.00560.00870.02871 802.11g 24120.01170.0090.04151 24370.00980.00630.03221 24620.01230.00620.03701 802.11n (HT20) 24120.00990.00750.03471 24370.0120.00770.03941 24620.01260.00660.03831 802.11n (HT40) 24220.01380.00740.04241 24370.00990.00760.03491 24520.0150.00670.04321 5.1GWiFiANTA: 5.1GWiFiANTB: Operating Mode Channel Frequency Measured Power Tuneup tolerance Max.Tuneup Power AntennaGain Powerdensityat 20cm Powerdensity Limits (mW/cm2) (MHz)(dBm)(dBm)(dBm)(dBi)(mW/cm2) 802.11a 518010.9810.98±1 11.982.65 0.00581 520011.4511.45±112.452.650.00641 524011.6111.61±112.612.650.00671 802.11n20 518010.2910.29±1 11.292.65 0.00491 520010.7410.74±111.742.650.00551 524011.4811.48±112.482.650.00651 802.11ac20 518010.2410.24±1 11.242.65 0.00491 520010.8110.81±111.812.650.00561 524011.8211.82±112.822.650.00701 802.11n40 519011.0411.04±1 12.042.65 0.00591 523011.7211.72±112.722.650.00691 802.11ac40 519010.3810.38±111.382.650.00501 523011.4111.41±1 12.412.65 0.00641 802.11ac80521011.5611.56±112.562.650.00661 Operating Mode Channel Frequency Measured Power Tuneup tolerance Max.Tuneup Power AntennaGain Powerdensityat 20cm Powerdensity Limits (mW/cm2) (MHz)(dBm)(dBm)(dBm)(dBi)(mW/cm2) 802.11a 518011.6911.69±1 12.692.65 0.00681 520010.5110.51±111.512.650.00521 524011.2811.28±112.282.650.00621 802.11n20 518010.2710.27±1 11.272.65 0.00491 520010.2710.27±111.272.650.00491 524011.8811.88±112.882.650.00711 802.11ac20 518011.2311.23±1 12.232.65 0.00611 520010.7710.77±111.772.650.00551 524011.1611.16±112.162.650.00601 802.11n40 519011.1111.11±1 12.112.65 0.00601 523010.8810.88±111.882.650.00561 802.11ac40 519011.2611.26±112.262.650.00621 523011.9811.98±1 12.982.65 0.00731 802.11ac80521010.9610.96±111.962.650.00581 ANTA+ANTB: 5.8GWiFiANTA: Operating Mode Channel Frequency ANTA Powerdensityat20cm ANTB Powerdensityat20cm ANTA+ANTB Powerdensityat20cm PowerdensityLimits (MHz)(mW/cm2)(mW/cm2)(mW/cm2)(mW/cm2) 802.11a 51800.00580.00680.02521 52000.00640.00520.02331 52400.00670.00620.02571 802.11n20 51800.00490.00490.01971 52000.00550.00490.02071 52400.00650.00710.02711 802.11ac20 51800.00490.00610.02201 52000.00560.00550.02211 52400.00700.00600.02601 802.11n40 51900.00590.00600.02361 52300.00690.00560.02501 802.11ac40 51900.00500.00620.02241 52300.00640.00730.02731 802.11ac8052100.00660.00580.02471 Operating Mode Channel Frequency Measured Power Tuneup tolerance Max.Tuneup Power AntennaGain Powerdensityat 20cm Powerdensity Limits (mW/cm2) (MHz)(dBm)(dBm)(dBm)(dBi)(mW/cm2) 802.11a 574511.5311.53±112.532.650.00661 578511.611.6±112.62.650.00671 582510.4210.42±111.422.650.00511 802.11n20 574511.0411.04±112.042.650.00591 578511.3511.35±112.352.650.00631 582510.5210.52±111.522.650.00521 802.11ac20 574511.2711.27±112.272.650.00621 578511.3711.37±112.372.650.00631 582510.7910.79±111.792.650.00551 802.11n40 575511.6111.61±112.612.650.00671 579511.8411.84±112.842.650.00701 802.11ac40 575…

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Test Report

Report No.: 18220WC10003502FCC ID: 2AWJK-WMT-C1Page 1 of 103 Code:AB-RF-05-a FCC Test Report Client Name:Grastron Technology CO., LTD Address: 4A Building NO.B, Dingxin Science and Technology Park, Honglangbei NO.2 Road, Xin'an street, Baoan district, Shenzhen, China Product Name:Wireless Presentation System Date:Jan. 28, 2021 Shenzhen Anbotek Compliance Laboratory Limited Report No.: 18220WC10003502FCC ID: 2AWJK-WMT-C1Page 2 of 103 Code:AB-RF-05-a Contents 1. General Information ............................................................................................................................................... 5 1.1. Client Information ....................................................................................................................................... 5 1.2. Description of Device (EUT) ..................................................................................................................... 5 1.3. Auxiliary Equipment Used During Test ................................................................................................... 6 1.4. Description of Test Modes ........................................................................................................................ 6 1.5. List of channels ........................................................................................................................................... 7 1.6. Description Of Test Setup ......................................................................................................................... 8 1.7. Test Equipment List .................................................................................................................................... 9 1.8. Measurement Uncertainty ....................................................................................................................... 10 1.9. Description of Test Facility ...................................................................................................................... 10 2. Summary of Test Results ................................................................................................................................... 11 3. Conducted Emission Test ................................................................................................................................... 12 3.1. Test Standard and Limit .......................................................................................................................... 12 3.2. Test Setup .................................................................................................................................................. 12 3.3. Test Procedure .......................................................................................................................................... 12 3.4. Test Data .................................................................................................................................................... 12 4. Radiation Spurious Emission and Band Edge ................................................................................................ 15 4.1. Test Standard and Limit .......................................................................................................................... 15 4.2. Test Setup .................................................................................................................................................. 15 4.3. Test Procedure .......................................................................................................................................... 16 4.4. Test Data .................................................................................................................................................... 17 5. Maximum Peak Output Power Test .................................................................................................................. 62 5.1. Test Standard and Limit .......................................................................................................................... 62 5.2. Test Setup .................................................................................................................................................. 62 5.3. Test Procedure .......................................................................................................................................... 62 5.4. Test Data .................................................................................................................................................... 62 6. Occupy Bandwidth Test ...................................................................................................................................... 66 6.1. Test Standard ............................................................................................................................................ 66 6.2. Test Setup .................................................................................................................................................. 66 6.3. Test Procedure .......................................................................................................................................... 66 6.4. Test Data .................................................................................................................................................... 66 7. Power Spectral Density Test .............................................................................................................................. 83 7.1. Test Standard and Limit .......................................................................................................................... 83 7.2. Test Setup .................................................................................................................................................. 83 7.3. Test Procedure ...........................................................................…

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Test Report

Report No.: 18220WC10003503FCC ID: 2AWJK-WMT-C1Page 1 of 108 Code:AB-RF-05-a FCC Test Report Client Name:Grastron Technology CO., LTD Address: 4A Building NO.B, Dingxin Science and Technology Park, Honglangbei NO.2 Road, Xin'an street, Baoan district, Shenzhen, China Product Name:Wireless Presentation System Date:Jan. 28, 2021 Shenzhen Anbotek Compliance Laboratory Limited Report No.: 18220WC10003503FCC ID: 2AWJK-WMT-C1Page 2 of 108 Code:AB-RF-05-a Contents 1. General Information ............................................................................................................................................... 5 1.1. Client Information ....................................................................................................................................... 5 1.2. Description of Device (EUT) ..................................................................................................................... 5 1.3. Auxiliary Equipment Used During Test ................................................................................................... 6 1.4. Description of Test Modes ........................................................................................................................ 6 1.5. List of channels ........................................................................................................................................... 7 1.6. Description Of Test Setup ......................................................................................................................... 8 1.7. Test Equipment List .................................................................................................................................... 9 1.8. Measurement Uncertainty ....................................................................................................................... 10 1.9. Description of Test Facility ...................................................................................................................... 10 2. Summary of Test Results ................................................................................................................................... 11 3. Conducted Emission Test ................................................................................................................................... 12 3.1. Test Standard and Limit .......................................................................................................................... 12 3.2. Test Setup .................................................................................................................................................. 12 3.3. Test Procedure .......................................................................................................................................... 12 3.4. Test Data .................................................................................................................................................... 12 4. Radiation Spurious Emission and Band Edge ................................................................................................ 15 4.1. Test Standard and Limit .......................................................................................................................... 15 4.2. Test Setup .................................................................................................................................................. 15 4.3. Test Procedure .......................................................................................................................................... 16 4.4. Test Data .................................................................................................................................................... 17 5. Maximum Peak Output Power Test .................................................................................................................. 53 5.1. Test Standard and Limit .......................................................................................................................... 53 5.2. Test Setup .................................................................................................................................................. 53 5.3. Test Procedure .......................................................................................................................................... 53 5.4. Test Data .................................................................................................................................................... 53 6. Occupy Bandwidth Test ...................................................................................................................................... 57 6.1. Test Standard ............................................................................................................................................ 57 6.2. Test Setup .................................................................................................................................................. 57 6.3. Test Procedure .......................................................................................................................................... 57 6.4. Test Data .................................................................................................................................................... 57 7. Power Spectral Density Test .............................................................................................................................. 88 7.1. Test Standard and Limit .......................................................................................................................... 88 7.2. Test Setup .................................................................................................................................................. 88 7.3. Test Procedure ...........................................................................…

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Test Setup Photos

PHOTOSOFTESTSETUP FCCID:2AWJK-WMT-C1 PhotoofPowerLineConductedEmissionTest PhotoofRadiationEmissionTest

Contact Information

Applicant

Haohang Hou(General Manager)

[email protected]86 0755-21610629Fax: N.A.

Technical Contact

Grastron Technology CO., LTD

[email protected]

China

Test Firm

Shenzhen Anbotek Compliance Laboratory LimitedJeff Zhu

[email protected]86-755-26064492Fax: 86-755-26014772

Technical Specifications

#	Rule Parts	Frequency Range	Power Output
2	15E	5.75 GHz - 5.83 GHz	25.00 mW

Confidentiality

Long Term

Grant Notes

Output power listed is maximum combined conducted power. This device contains 20, 40 and 80 MHz signal bandwidth. Device is a 2x2 MIMO as is described in the filing. The antennas used with this transmitter must be installed to provide a minimum separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter, except in accordance with FCC multi- transmitter product procedures. End-users must be provided with operating procedures for satisfying RF exposure compliance.