2BK4NKARXDB100KARX Dock

(DuduWorkInc) FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:2024-9-26 FCCID:2BK4NKARXDB100 Ref.#1:AttestationStatementsPart2.911(d)(5)(i)Filing (DuduWorkInc)certifiesthattheequipmentforwhichauthorizationissoughtisnot “covered”equipmentprohibitedfromreceivinganequipmentauthorizationpursuantto section2.903oftheFCCrules. Ref.#2:AttestationStatementsPart2.911(d)(5)(ii)Filing (DuduWorkInc)certifiesthat,asofthedateofthefilingoftheapplication,the applicantisnotidentifiedontheCoveredListasanentityproducing“covered” equipment. Applicant:DuduWorkInc Address:30NGouldStste42110Sheridan82801WYUS 2024-9-26 ContactPerson:CEO Tel.:+1(307)533-7580 Email:[email protected] Sincerely, Signature:

1/1 USAgentforServiceofProcessLETTEROFATTESTATION TO: OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USAgentforServiceofProcess: CompanyName:DuduWorkInc FRN:0035944602 ContactName:GangXu Address:30NGouldStste42110Sheridan82801WYUS TelephoneNo:+1(307)533-7580 Email:[email protected] Applicant: Companyname:DuduWorkInc ProductDescription:KARXDock Granteecode:2BK4N FCCID:2BK4NKARXDB100 ContactName:GangXu Address:30NGouldStste42110Sheridan82801WYUS TelephoneNo:+1(307)533-7580 Email:[email protected] [DuduWorkInc]certifiesthat,asofthedateofthisfilingoftheapplication withtheTCB,DuduWorkInc]isourdesignatedUSagentforserviceofprocess fortheabovereferencedFCCID.[2BK4NKARXDB100]acceptstomaintainan agentfornolessthanoneyearafterthegranteehasterminatedallmarketing andimportationortheconclusionofanycommissionrelatedproceeding involvingequipment.[DuduWorkInc]accepts,asofthedateofthefilingof theapplication,theobligationofthedesignatedUSagentforserviceofprocess fortheabovereferenceFCCID. TheUSAgentforServiceofProcessisawareofandagreestocomplywiththerequirements outlinedintheFCCEquipmentAuthorizationProgram,ReportandOrderFCC22-84,andclause §2.911. TheApplicantisawareofandagreestocomplywiththerequirementsoutlinedintheFCC EquipmentAuthorizationProgram,ReportandOrderFCC22-84,andclause§2.911. Date:2024-9-26 Applicant’sName:GangXuUSAgent’sName:GangXu Title:CEOTitle:CEO SignatureSignature

ShenZhen Feasycom Technology Co.,Ltd www.feasycom.com -1- Bluetooth antenna specification 1，Index Item Content Page Remark 1 Index 1 2 Spec Drawing 2 3 Specification 2 4 Antenna On Test Board 3 5 Return Loss 3 6 Radiation Pattern 3 Document Type: 2.4GHZ PCB antenna Document Version: V1.0 Release Date: 2019-10-21 ShenZhen Feasycom Technology Co.,Ltd Telephone: 86-755-27924639 www.feasycom.com Box 508, Building A, Fenghuang Zhigu, No. 50, Tiezai Road, Gongle Community, Xixiang Street, Baoan District, Shenzhen ShenZhen Feasycom Technology Co.,Ltd www.feasycom.com -2- 2，Spec Drawing Unit：mm ShenZhen Feasycom Technology Co.,Ltd www.feasycom.com -3- 3，Specification Product Number: 2.4GHZ PCB antenna Sample Photo: A.Electrical Characteristics Frequency 2400 ~ 2500 MHz S.W.R. <=2.0 Gain 1.98 dBi Efficiency ~ 40% Polarization Linear Impedance 50 Ohm B. Material & Mechanical Characteristics Material of Radiator copper C. Environmental Operation Temperature -40°C ~ + 85°C Storage Temperature -40°C ~ + 105°C 4，Antenna On Test Board ShenZhen Feasycom Technology Co.,Ltd www.feasycom.com -4- 5, Return Loss 6，Radiation Pattern Radiation Pattern and Gain were dependent on measurement board design. The specification of coil antenna was measur ed based on the PCB size and installation position as shown in the below figure Test Board. ShenZhen Feasycom Technology Co.,Ltd www.feasycom.com -5- Vertical Horizontal Y - Z Plane Average Gain=1.86 dBi Peak Gain = 1.98 dBi Average Gain = 0.71 dBi Peak Gain= -1.37 dBi Average Gain= - 4.6 dBi X - Z Plane Average Gain=-2.91dBi Peak Gain= -3.76 dBi Average Gain= -8.72dBi Peak Gain= -0.25 dBi Average Gain= -4.24 dBi X - Y Plane Average Gain=-0.95 dBi Peak Gain= 0.76 dBi Average Gain= -5.81dBi Peak Gain= 1.37 dBi Average Gain= -2.67 dBi

DuduWorkInc Date：2024-9-26 ProductModelNumber:KARX-DB100 FCCID：2BK4NKARXDB100 Towhomitmayconcern, Re:ProductCertificationRepresentativeAuthorizationLetter WeauthorizeQAILaboratoriesLtd.3980NorthFraserWay,BurnabyB.C. CanadaV5J5K5toactonourbehalfonallmattersconcerningtheabove namedequipment. Thisshallincludethefollowing: Testing Approvalapplicationsandprocedures WedeclarethatORGANIZATION.isallowedtoforwardallinformation relatedtotheapprovalprojecttotheappliedcertificationbodyandtothe notificationentitiesandtodiscussanyissuesconcerningtheapproval application.AnyandallactscarriedoutbyORGANIZATION.onourbehalf shallhavethesameeffectasactsofourown. By: ContactListedonFCCWesbite Title:CEO Email:[email protected] Telephone:+1(307)533-7580 Onbehalfof:DuduWorkInc

DuduWorkInc. OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USA Date:September26,2024 Subject;RequestforConfidentiality FCCID:2BK4NKARXDB100 ToWhomItMayConcern, PursuanttotheprovisionsoftheCommission’srulesTitle47Sections§0.457and§0.459,we arerequestingtheCommissiontowithholdthefollowingattachment(s)asconfidential documentsfrompublicdisclosureindefinitely. Thesedocumentscontaindetailedsystemandequipmentdescriptionsandareconsideredas proprietaryinformationinoperationoftheequipment.Thepublicdisclosureofthese documentsmightbeharmfultoourcompanyandwouldgivecompetitorsanunfairadvantage inthemarket. SchematicDiagram BlockDiagram PartsList OperationalDescription Tune-upProcedure SoftwareSecurityRequirementsforUNIIdevices 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:GangXu Title:CEO

FCCID:2BK4NKARXDB100 RFEXPOSUREEVALUATIONMETHOD AccordingtoKDB447498D01GeneralRFExposureGuidancev06,Unlessspecificallyrequiredbythe publishedRFexposureKDBprocedures,standalone1-gheadorbodyand10-gextremitySARevaluation forgeneralpopulationexposureconditions,bymeasurementornumericalsimulation,isnotrequiredwhen thecorrespondingSARTestExclusionThresholdcondition(s),listedbelow,is(are)satisfied. For100MHzto6GHzandtestseparationdistances≤50mm,the1-gand10-gSARtestexclusion thresholdsaredeterminedbythefollowing: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparationdistance,mm)]·[√f (GHz) ] ≤3.0for1-gSAR,and≤7.5for10-gextremitySAR,where f (GHz) istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation Theresultisroundedtoonedecimalplaceforcomparison AccordingtoFCC1.1310:Thecriterialistedinthefollowingtableshallbeusedto evaluatetheenvironmentimpactofhumanexposuretoradiofrequency(RF)Radiation asspecifiedin§1.1307(b) EUTSpecification EUT KARXDock Frequencyband (Operating) WLAN:2.412GHz~2.462GHz WLAN:5.150GHz~5.250GHz WLAN:5.725GHz~5.850GHz OthersBT:2402-2480MHz DevicecategoryPortable(<20cmseparation) Mobile(>20cmseparation) Others ExposureclassificationOccupational/Controlledexposure(S=5mW/cm2) GeneralPopulation/Uncontrolledexposure (S=1mW/cm 2 ) AntennadiversitySingleantenna Multipleantennas Txdiversity Rxdiversity Tx/Rxdiversity Max.outputpower3.054dBm(0.00202W) Antennagain(Max)1.98dBi EvaluationappliedMPEEvaluation SAREvaluation FCCID:2BK4NKARXDB100 RFEXPOSUREEVALUATIONMETHOD SARTestExclusionThresholdsfor100MHz – 6GHzand ≤ 50mm ApproximateSARTestExclusionPowerThresholdsatSelectedFrequenciesandTestSeparation DistancesareillustratedinthefollowingTable. The1-gand10-gSARtestexclusionthresholdsfor100MHzto6GHzattestseparation distances≤50mmaredeterminedby: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparationdistance, mm)] · [ √ f(GHz)] ≤ 3.0for1-gSARand ≤ 7.5for10-gextremitySAR,where f(GHz)istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation Theresultisroundedtoonedecimalplaceforcomparison Thetestexclusionsareapplicableonlywhentheminimumtestseparationdistanceis ≤ 50 mmandfortransmissionfrequenciesbetween100MHzand6GHz.Whentheminimumtest separationdistanceis<5mm,adistanceof5mmisappliedtodetermineSARtest exclusion. FCCID:2BK4NKARXDB100 Maximummeasuredtransmitterpower. BR+EDR Operating Mode Freque ncy Measur ed Power max. power Antenna Gain min.test separation distance [√f(GHz)] ResultLimit (MHz)(dBm)(mW)(dBi)(mm) GFSK 24020.9401.241.9851.5500.60723 24412.4251.751.9851.5620.86163 24803.2232.101.9851.5751.04373 π/4DQPSK 24021.6101.451.9851.5500.70853 24413.1712.081.9851.5621.02313 24803.8372.421.9851.5751.20213 8-DPSK 24020.8561.221.9851.5500.59553 24412.3851.731.9851.5620.85373 24803.0542.021.9851.5751.00383 Remark:Thebestcasegainoftheantennais1.98dBi. 1.98dBilogarithmictermsconverttonumericresultisnearly1.58 The1-gand10-gSARtestexclusionthresholdsfor100MHzto6GHzattest separationdistances≤50mmaredeterminedby: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)] ThetestResultislessthan3.0for1-gSARand≤7.5for10-gextremitySAR. Conclusion:NoSARisrequired.

BSL Testing Co.,Ltd. Report No.: BSL24070084P02-R01 Page 1 of 42 FCC PART 15 SUBPART C TEST REPORT FCC PART 15.247 Report Reference No........................:BSL24070084P02-R01 FCC ID. ................................................ :2BK4NKARXDB100 Compiled by ( position+printed name+signature)..: Engineer/ Cindy Zheng Supervised by ( position+printed name+signature) .. : Manager/Haley Wen Approved by ( position+printed name+signature) .. : RF Manager/ Vivian Jiang Date of issue ......................................... :September 24, 2024 Testing Laboratory Name................: BSL Testing Co., Ltd. Address.................................................: 1/F, Building B, Xinshidai GR Park,Shiyan Street, Bao'an District, Shenzhen,Guangdong, 518052, People’s Republic of China Applicant’s name ............................... : DuduWork Inc Address ................................................. : 30 N Gould St ste 42110 Sheridan 82801 WY US Test specification..............................: Standard ................................................ :FCC Part 15.247 BSL Testing Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the BSL Testing Co., Ltd. is acknowledged as copyright owner and source of the material. BSL Testing Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description........................: Online Voice Recorder Trade Mark............................................: KARX Manufacturer.........................................: DuduWork Inc Model/Type reference ......................... : DB100 Listed Models ...................................... : N/A Modulation...........................................:GFSK, Π/4DQPSK, 8DPSK Frequency .............................................. From 2402MHz to 2480MHz Rating ..................................................... :DC 5V by USB port Result.....................................................:PASS BSL Testing Co.,Ltd. Report No.: BSL24070084P02-R01 Page 2 of 42 TEST REPORT Equipment under Test:Online Voice Recorder Model /Type:DB100 Listed Models:N/A Model Declaration:N/A Applicant : DuduWork Inc Address: 30 N Gould St ste 42110 Sheridan 82801 WY US Manufacturer : DuduWork Inc Address: 30 N Gould St ste 42110 Sheridan 82801 WY US Test Result : PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. BSL Testing Co.,Ltd. Report No.: BSL24070084P02-R01 Page 3 of 42 Contents 1T E S T S T A N D A R D S ...................................................................................................................4 2S U M M A R Y ...................................................................................................................................... 5 2.1General Remarks5 2.2Product Description5 2.3Equipment Under Test5 2.4Short description of the Equipment under Test (EUT)5 2.5EUT operation mode6 2.6Block Diagram of Test Setup6 2.7Related Submittal(s) / Grant (s)6 2.8Modifications6 3T E S T E N V I R O N M E N T ............................................................................................................. 7 3.1Address of the test laboratory7 3.2Test Facility7 3.3Environmental conditions7 3.4Summary of measurement results8 3.5Statement of the measurement uncertainty8 3.6Equipments Used during the Test9 4T E S T C O N D I T I O N S A N D R E S U L T S ............................................................................1 1 4.1AC Power Conducted Emission11 4.2Radiated Emission14 4.3Maximum Peak Output Power20 4.420dB Bandwidth23 4.5Frequency Separation26 4.6Number of hopping frequency28 4.7Time of Occupancy (Dwell Time)30 4.8Out-of-band Emissions33 4.9Pseudorandom Frequency Hopping Sequence39 4.10 Antenna Requirement40 5T E S T S E T U P P H O T O S O F T H E E U T ..........................................................................4 1 6P H O T O S O F T H E E U T .........................................................................................................4 2 BSL Testing Co.,Ltd. Report No.: BSL24070084P02-R01 Page 4 of 42 1TESTSTANDARDS The tests were performed according to following standards: FCC Rules Part 15.247 : Frequency Hopping, Direct Spread Spectrum and Hybrid Systems that are in operation within the bands of 902-928 MHz, 2400-2483.5 MHz, and 5725-5850MHz. ANSI C63.10-2013 : American National Standard for Testing Unlicensed Wireless Devices BSL Testing Co.,Ltd. Report No.: BSL24070084P02-R01 Page 5 of 42 2 SUMMARY 2.1 General Remarks Date of receipt of test sample: September 14, 2024 Testing commenced on:September 24, 2024 Testing concluded on: September 24, 2024 2.2 Product Description Product Name: Online Voice Recorder Model/Type reference: DB100 Power supply:DC 5V by USB port Adapter information (Auxiliary test supplied by testing Lab） Model: EP-TA20CBC Input: AC 100-240V 50/60Hz Output: DC 5V 2A Firmware Version: EPTA5.14.2 Manufacture: Huizhou Dongyang Yienbi Electronics Co., Ltd Hardware version:V1.2 Software version:494 Testing sample ID： BSL24070084P02-R01-1# (Engineer sample) BSL24070084P02-R01-2# (Normal sample) Bluetooth : Supported Type:Bluetooth BR/EDR Modulation:GFSK, π/4DQPSK, 8DPSK Operation frequency:2402MHz~2480MHz Channel number:79 Channel separation:1MHz Antenna type: PCB antenna Antenna gain:1.98 dBi 2.3 Equipment Under Test Power supply system utilised Power supply voltage: ○ 230V / 50 Hz ○ 120V / 60Hz ○ 12 V DC ○ 24 V DC ● Other (specified in blank below) DC 5V From USB port 2.4 Short description of the Equipment under Test (EUT) This is a Online Voice Recorder. For more details, refer to the user’s manual of the EUT. BSL Testing Co.,Ltd. Report No.: BSL24070084P02-R01 Page 6 of 42 2.5 EUT operation mode T…

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FCCID：2BK4NKARXDB100 FCCID：2BK4NKARXDB100