2AQ9R-BH520Bone conduction wireless earphone

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Shenzhen Elenose Technology Co. LTD 2022.11.07 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: Bone conduction wireless earphone Trademark: N/A MODEL: BH520 FCC ID:2AQ9R-BH520 To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the - Block Diagram - Schematics - Operational Description required to be submitted with this application be permanently withheld from public review. The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. Please contact me if there is any information you may need. Sincerely, Client’s signature: Client’s name / title : Zhedong He / CEO Contact information / address: Room 423, Building 8, Zijing No.1, Huahui Road, Tongsheng Community, Dalang Street, Longhua District, Shenzhen, Guangdong, China

Shenzhen Elenose Technology Co. LTD 2022.11.07 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Shenzhen BCTC Testing Co., Ltd to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Client’s signature: Client’s name / title : Zhedong He / CEO Contact information / address: Room 423, Building 8, Zijing No.1, Huahui Road, Tongsheng Community, Dalang Street, Longhua District, Shenzhen, Guangdong, China

External Photos

Label & label location 10mm*5mm FCC ID:2AQ9R-BH520 Label location

Internal Photos Antenna

HM3216ANT2450-HM02_V1.0Page 1 of8 深圳市恒信达通信科技有限公司 ShenzhenHengXinDaTechnologyCo.,Ltd. SPECIFICATION CeramicAntenna3216Size 2400-2500MHz P/N:HXD-BT5-HM02 深圳市恒信达通信科技有限公司 ShenzhenHengxindaTechnologyCo.,Ltd. HXD-BT5-HM02_V1.0Page 2 of8 ForMiniaturizedBluetoothSystem 3.Dimensions(Unit:mm) 1).OverView: 2).PCBLYOUTVIEW: 1.Frequency 2400-2500MHz 2.Applications 深圳市恒信达通信科技有限公司 ShenzhenHengxindaTechnologyCo.,Ltd. HXD-BT5-HM02_V1.0Page 3 of8 4.EvaluationBoardSizeandMatchingCircuits 5.ElectricalCharacteristics 0.5pF 4.7nH PartNumberHM3216ANT2450-HM02 CentralFrequency2450MHz Bandwidth100(typ.)MHz V.S.W.R≤2.0 PeakGain4.34dBi Impedance50Ohm PolarizationLinear AzimuthBeamwidthOmni-directional 深圳市 恒信达 通信 科技有限公司 ShenzhenHengxindaTechnologyCo., Ltd. HXD-BT5-HM02_V1.0Page 4 of 8 6.ReturnLoss (S11) 7.RadiationPattern&Efficiency Frequency(MHz)240024502500 Efficiency(dB)-1.87-1.67-1.94 Efficiency(%)656864 Gain (dBi)3.124.343.45 深圳市恒信达通信科技有限公司 ShenzhenHengxindaTechnologyCo.,Ltd. HXD-BT5-HM02_V1.0Page 5 of8 8.ReflowSolderingStandardCondition 9.PackagingandDimensions PlasticTape 深圳市恒信达通信科技有限公司 ShenzhenHengxindaTechnologyCo.,Ltd. HXD-BT5-HM02_V1.0Page 6 of8 RemarksforPackage Reservealengthof150~200mmforthetrailerofthecarrierand250~300mmfor theleaderofthecarrerandfurther250mmofcovertapeattheleadingpartofthe carrier. Reel(6000pcs/Reel) StoragePeriod OxidizableMaterial,12monthsinvacuumsealedbag,pleaserepackwithin168 hoursbyre-sealthepackagetreatmentafterusing. StorageTemperatureRange:<30degreeC,Humidity:<60%RH 深圳市恒信达通信科技有限公司 ShenzhenHengxindaTechnologyCo.,Ltd. HXD-BT5-HM02_V1.0Page 7 of8 10.DependabilityTest TestitemTestcondition/TestmethodSpecification Solderability IEC60068-2-58 GB/T2423.28 *Solderbathtemperature：240±5°C *Immersiontime：2±0.5sec Solder：Sn96.5Ag3.0Gu0.5for lead-free. Atleast95%ofasurfaceofeach terminalelectrodemustbecovered byfreshsolder. Leaching(Resistance todissolutionof metallization) JISC5101 *Solderbathtemperature：260±5°C *Leachingimmersiontime：10±1sec Solder:Sn96.5Ag3.0Gu0.5for lead-free. Lossofmetallizationontheedgesof eachelectrodeshallnotexceed25%. Resistanceto solderingheat IEC60068-2-58 GB/T2423.28 *Preheatingtemperature：120~150°C,1 minute. *Soldertemperature：260±5°C *Immersiontime：10±1secSolder： Sn96.5Ag3.0Gu0.5forlead-free Measurementtobemadeafterkeeping atroomtemperaturefor24±2hrs. Nomechanicaldamage. Electricalspecificationshallsatisfy thedescriptionsinelectrical characteristicsattheroom temperature. Lossofmetallizationontheedgesof eachelectrodeshallnotexceed25%. DropTest IEC60068-2-32 GB/T2423.8 Customer’s specification. *Height：50cm *TestSurface:Rigidsurfaceofconcreteor steel. *Times：6surfacesforeachunits；2timesfor eachside. Nomechanicaldamage. Electricalspecificationshallsatisfythe descriptionsinelectricalcharacteristicsat theroomtemperature. Vibration IEC60068-2-6 GB/T2423.10 *Frequency：10Hz~55Hz~10Hz(1min) *Totalamplitude：1.5mm *Testtimes：6hrs.(Twohrseachinthree mutuallyperpendiculardirections) Nomechanicaldamage. Electricalspecificationshallsatisfythe descriptionsinelectricalcharacteristicsat theroomtemperature. AdhesiveStrengthof Termination IEC60068-2-21 GB/T2423.6 *Pressurizingforce： 5N(≦0603)；10N(>0603) *Testtime:10±1sec Noremarkabledamageorremovalofthe termination. 深圳市恒信达通信科技有限公司 ShenzhenHengxindaTechnologyCo.,Ltd. HXD-BT5-HM02_V1.0Page 8 of8 Bendingtest IEC60068-2-21 GB/T2423.29 Themiddlepartofsubstrateshallbe pressurizedbymeansofthepressurizingrod atarateofabout1mm/sperseconduntilthe deflectionbecomes2mmandthenpressure shallbemaintainedfor10±1sec. Measurementtobemadeafterkeepingat roomtemperaturefor24±2hours. Nomechanicaldamage. Electricalspecificationshallsatisfythe descriptionsinelectricalcharacteristicsat theroomtemperature. Temperaturecycle IEC60068-2-14 GB/T2423.22 30minutesat-40°C±2°C. 10~15minutesatroomtemperature. 30minutesat+85°C±2°C. 10~15minutesatroomtemperature. Total100continuouscyclesMeasurement tobemadeafterkeepingatroom temperaturefor24±2hrs. Nomechanicaldamage. Electricalspecificationshallsatisfythe descriptionsinelectricalcharacteristicsat theroomtemperature. Hightemperature IEC60068-2-2 GB/T2423.2 *Temperature：85±2°C. *Testduration：500+24/-0hours. Measurementtobemadeafterkeepingat roomtemperaturefor24±2hrs. Nomechanicaldamage. Electricalspecificationshallsatisfythe descriptionsinelectricalcharacteristics. Humidity(steady conditions) IEC60068-2-3 GB/T2423.3 *Humidity：85±5%R.H. *Temperature：85±2°C. *Time：500+24/-0hrs. Measurementtobemadeafterkeeping atroomtemperaturefor24±2hrs ※200hrsmeasuringthefirstdatathen300hrs data. Nomechanicaldamage. Electricalspecificationshallsatisfythe descriptionsinelectricalcharacteristicsat theroomtemperature. Lowtemperature IEC60068-2-1 GB/T2423.1 *Temperature：-40±2°C. *Testduration：500+24/-0hours Measurementtobemadeafterkeepingat roomtemperaturefor24±2hrs. Nomechanicaldamage. Electricalspecificationshallsatisfythe descriptionsinelectricalcharacteristicsat theroomtemperature.

RF EXPOSURE EVALUATION METHOD FCC ID:2AQ9R-BH520 Applicable standard： In accordance with FCC 47 CFR part 2 (2.1093) this device has been defined as a portable device which is defined as a transmitting device designed to be used so that the radiating structure(s) of the device is/are within 20 centimeters of the body of the user. Portable devices must be evaluated using the specified in FCC 47 CFR part 2 (2.1093) and ANSI/IEEEC95.1-1992. and had been tested in accordance with the measurement methods and procedures specified in IEEE 1528-2003. Per FCC KDB 447498 D01 v06, the 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances s 50 mm are determined by: SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following Table. 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. BT Modulation Test Channel Output Power (dBm) Limit (dBm) GFSK Low 1.73 21 GFSK Middle 2.03 21 GFSK High 1.90 21 π/4DQPSK Low 2.58 21 π/4DQPSK Middle 2.81 21 π/4DQPSK High 2.63 21 max possible output power (PK,conducted)：3±1dBm 4.34dBi logarithmic terms convert to numeric result is nearly 2.716 4dBm=2.51mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=2.51/5*√2.402 =0. 78≤3.0 2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 2.51/5*√2.441 =0. 78≤3.0 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 2.51/5*√2.48=0. 79≤3.0 Conclusion: 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.

No.：BCTC/RF-EMC-005 Page 1 of 66 Edition：A.5 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2210714924E Applicant: Shenzhen Elenose Technology Co. LTD Product Name: Bone conduction wireless earphone Model/Type Ref.: BH520 Tested Date: 2022-10-25 to 2022-11-01 Issued Date: 2022-11-01 Report No.: BCTC2210714924E No.：BCTC/RF-EMC-005 Page 2 of 66 Edition：A.5 FCC ID:2AQ9R-BH520 The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen BCTC Testing Co., Ltd, this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. Product Name: Bone conduction wireless earphone Trademark: N/A Model/Type Ref.: BH520 Prepared For: Shenzhen Elenose Technology Co. LTD Address: Room 423, Building 8, Zijing No.1, Huahui Road, Tongsheng Community, Dalang Street, Longhua District, Shenzhen, Guangdong, China Manufacturer: Shenzhen Elenose Technology Co. LTD Address: Room 423, Building 8, Zijing No.1, Huahui Road, Tongsheng Community, Dalang Street, Longhua District, Shenzhen, Guangdong, China Prepared By: Shenzhen BCTC Testing Co., Ltd. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Zhancheng, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2022-10-25 Sample tested Date: 2022-10-25 to 2022-11-01 Issue Date: 2022-11-01 Report No.: BCTC2210714924E Test Standards: FCC Part15.247 ANSI C63.10-2013 Test Results: PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Jeff.Fu/Project Handler Zero Zhou/Reviewer Report No.: BCTC2210714924E No.：BCTC/RF-EMC-005 Page 3 of 66 Edition：A.5 Table Of Content Test Report Declaration Page 1. Version .................................................................................................................. 5 2. Test Summary ....................................................................................................... 6 3. Measurement Uncertainty ..................................................................................... 7 4. Product Information And Test Setup ..................................................................... 8 4.1 Product Information ............................................................................................... 8 4.2 Test Setup Configuration ...................................................................................... 8 4.3 Support Equipment ............................................................................................... 8 4.4 Channel List .......................................................................................................... 9 4.5 Test Mode ............................................................................................................. 9 4.6 table of parameters of text software setting .......................................................... 9 5. Test Facility And Test Instrument Used ............................................................... 10 5.1 Test Facility ......................................................................................................... 10 5.2 Test Instrument Used .......................................................................................... 10 6. Conducted Emissions .......................................................................................... 12 6.1 Block Diagram Of Test Setup .............................................................................. 12 6.2 Limit .................................................................................................................... 12 6.3 Test Procedure ................................................................................................... 12 6.4 EUT Operating Conditions .................................................................................. 12 6.5 Test Result .......................................................................................................... 13 7. Radiated Emissions ............................................................................................. 15 7.1 Block Diagram Of Test Setup .............................................................................. 15 7.2 Limit .................................................................................................................... 16 7.3 Test Procedure ................................................................................................... 17 7.4 EUT Operating Conditions .................................................................................. 18 7.5 Test Result .......................................................................................................... 18 8. Radiated Band Emission Measurement And Restricted Bands Of Operation ..... 22 8.1 Block Diagram Of Test Setup .............................................................................. 22 8.2 Limit .................................................................................................................... 22 8.3 Test Procedure ................................................................................................... 23 8.4 EUT Operating Conditions .................................................................................. 23 8.5 Test Result .......................................................................................................... 24 9. Conducted Emission ........................................................................................... 25 9.1 Block Diagram Of Test Setup .............................................................................. 25 9.2 Limit .................................................................................................................... 25 9.3 Test Procedure ................................................................................................... 25 9.4 Test …

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Report No.: BCTC2210714924E No.：BCTC/RF-EMC-005 Page 64 of 66 Edition：A.5 17. EUT Test Setup Photographs Conducted Emissions Photo Radiated Measurement Photos Report No.: BCTC2210714924E No.：BCTC/RF-EMC-005 Page 65 of 66 Edition：A.5