PRDKB45Wireless Silent Keyboard

AcroxTechnologiesCo.,Ltd. I,thesigner, GavinHsieh Thedifferencebetweenthefollowingtwoproductsjustliesinthemodel,theotheristhe same. ItemName：WirelessSilentKeyboard FCCID:PRDKB45 ModelNumber:KSB AdditionalModel:100012579 Signature: Name:GavinHsieh Title:ProductManager Company:AcroxTechnologiesCo.,Ltd.

DATE:2021.03.04 EquipmentAutorisationDivision FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 FCCID:PRDKB45 ProductName:WirelessSilentKeyboard RequestforConfidentiality PursuanttoSections0.457and0.459ofthecommissionsrules,weherebyrequestthat thefollowingdocumentsbeheldconfidential: (Listherethedocumentsforwhichyouareseekingconfidentiality–forexample...) Schematics Blockdiagram  Operationdescription Thesematerialscontaintradesecretsandproprietaryinformationandarenot customarilyreleasedtothepublic.Thepublicdisclosureofthisinformationmightbe harmfultothecompanyandprovideunjustifiedbenefitstoourcompetitors. <Signature> Name:GavinHsieh Title:ProductManager Company:AcroxTechnologiesCo.,Ltd.

DATE:2021.03.04 FederalCommunicationsCommission Authorization&EvaluationDivision 7345OaklandMillsRoad Columbia,Maryland21046 AuthoritytoActasAgent Onourbehalf,IappointESTTechnologyCo.,Ltd.Address:Chilingxiang,Qishantou,Santun, Houjie,Dongguan,Guangdong,China (NameofAgentcompanynameandaddress)toact asouragentinthepreparationofthisapplicationforequipmentcertification.Icertifythat submitteddocumentsproperlydescribethedeviceorsystemforwhichequipment certificationissought.Ialsocertifythateachunitmanufactured,importedormarketed,as definedintheFederalCommunicationsCommission’sregulationswillhaveaffixedtoita labelidenticaltothatsubmittedforapprovalwiththisapplication. Forinstanceswhereourauthorizedagentsignstheapplicationforcertificationonour behalf,Iacknowledgethatallresponsibilityforcomplyingwiththetermsandconditions forcertification,stillresideswithAcroxTechnologiesCo.,Ltd.Address:4F.,No.89, MinshanSt.,NeihuDist.,TaipeiCity,114,Taiwan(ApplicantNameandaddress) <Signature> Name:GavinHsieh Title:ProductManager Company:AcroxTechnologiesCo.,Ltd.

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FCC ID: PRDKB45 EST Technology Co., Ltd Report No. ESTE-R2103022 Page 1 of 3 FCC RF EXPOSURE REPORT Acrox Technologies Co., Ltd. Wireless Silent Keyboard Model Number: KSB Additional Model: 100012579 FCC ID: PRDKB45 Prepared for: Acrox Technologies Co., Ltd. 4F.,No.89,Minshan St., Neihu Dist., Taipei City 114,Taiwan,R.O.C Prepared By: EST Technology Co., Ltd. Chilingxiang, Qishantou, Santun, Houjie, Dongguan, Guangdong, China Tel: 86-769-83081888-808 Report Number: ESTE-R2103022 Date of Test: Feb. 22~Mar. 03, 2021 Date of Report: Mar. 04, 2021 FCC ID: PRDKB45 EST Technology Co., Ltd Report No. ESTE-R2103022 Page 2 of 3 1. Applicable Standards FCC Part 2(Section 2.1093) FCC KD B447498 D01 General RF Exposure Guidance v06 2. Exposure Evaluation of Portable or Mobile Devices Human exposure to RF emissions from portable devices (47 CFR §2.1093), as defined by the FCC, must be evaluated with respect to the FCC-adopted limits for SAR. Evaluation of mobile devices, as defined by the FCC, may also be performed with respect to SAR limits, but in such cases it is usually simpler and more cost-effective to evaluate compliance with respect to field strength or power density limits. For certain devices that are designed to be used in both mobile and portable configurations similar to those described in 47 CFR §2.1091(d)(4), such as certain desktop phones and wireless modem modules, compliance for mobile configurations is also satisfied when the same device is evaluated for SAR compliance in portable configurations. SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] · [√f(GHz)] ≤3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR where • f(GHz) is the RF channel transmit frequency in GHz • Power and distance are rounded to the nearest mW and mm before calculation • The result is rounded to one decimal place for comparison The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. FCC ID: PRDKB45 EST Technology Co., Ltd Report No. ESTE-R2103022 Page 3 of 3 3. Evaluation Results For 2.4G SRD Ant gain=0.9 dBi Ant numeric gain= 1.230 Field strength =63.52 dBuV/m@3m P={ [10 (63.52 /20) /10 6 *3] 2 / (30*1.230) }*1000mW =0.00055mW Pr=0.00055/5*1.562=0.00017<3 Note: 1. [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] * [√f(GHz)] < 3.0 2. SAR Test Exclusion Thresholds is 3.0 for separation distance 5mm. Therefore, SAR test is not required. End of Test Report

FCCID:PRDKB45 ESTTechnologyCo.,LtdReportNo.ESTE-R2103021Page1of46 FCCPART15CTESTREPORTFORCERTIFICATION OnBehalfof AcroxTechnologiesCo.,Ltd. WirelessSilentKeyboard ModelNumber:KSB AdditionalModel:100012579 FCCID:PRDKB45 Preparedfor:AcroxTechnologiesCo.,Ltd. 4F.,No.89,MinshanSt.,NeihuDist.,TaipeiCity114,Taiwan,R.O.C PreparedBy:ESTTechnologyCo.,Ltd. Chilingxiang,Qishantou,Santun,Houjie,Dongguan,Guangdong,China Tel:86-769-83081888-808 ReportNumber:ESTE-R2103021 DateofTest:Feb.22~Mar.03,2021 DateofReport:Mar.04,2021 FCCID:PRDKB45 ESTTechnologyCo.,LtdReportNo.ESTE-R2103021Page2of46 TABLEOFCONTENTS DescriptionPage TESTREPORTVERIFICATION........................................................................................................................3 1.GENERALINFORMATION................................................................................................................4 1.1.DescriptionofDevice(EUT)............................................................................................................4 1.2.AntennaInformation.........................................................................................................................4 2.SUMMARYOFTEST.........................................................................................................................5 2.1.Summaryoftestresult.......................................................................................................................5 2.2.TestFacilities....................................................................................................................................6 2.3.Measurementuncertainty..................................................................................................................7 2.4.Assistantequipmentusedfortest......................................................................................................7 2.5.BlockDiagram..................................................................................................................................7 2.6.TestMode..........................................................................................................................................8 2.7.PowerSettingofTestSoftware.........................................................................................................8 2.8.ChannelList......................................................................................................................................8 2.9.TestEquipmentList..........................................................................................................................9 3.FIELDSTRENGTHOFFUNDAMENTAL...........................................................................................10 3.1.Limit................................................................................................................................................10 3.2.TestSetup........................................................................................................................................10 3.3.SpectrumAnalyzerSetting..............................................................................................................10 3.4.TestProcedure.................................................................................................................................11 3.5.TestResult.......................................................................................................................................12 4.RADIATEDSPURIOUSEMISSIONSANDBANDEDGE.....................................................................19 4.1.Limit................................................................................................................................................19 4.2.TestSetup........................................................................................................................................21 4.3.SpectrumAnalyzerSetting..............................................................................................................22 4.4.TestProcedure.................................................................................................................................23 4.5.TestResult.......................................................................................................................................24 5.20DBBANDWIDTH.......................................................................................................................36 5.1.Limit................................................................................................................................................36 5.2.TestSetup........................................................................................................................................36 5.3.SpectrumAnalyzerSetting..............................................................................................................36 5.4.TestProcedure.................................................................................................................................36 5.5.TestCondition.................................................................................................................................36 5.6.TestResult.......................................................................................................................................37 6.ANTENNAREQUIREMENTS............................................................................................................39 6.1.Limit................................................................................................................................................39 6.2.TestResult.......................................................................................................................................39 7.TESTSETUPPHOTO.................................................................................................................40 8.EUTPHOTO...............................…

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TESTSETUPPHOTO RadiatedTest(Below1GHz) RadiatedTest(Above1GHz)