2AX2T-EW24Wireless earphone

Hoco technology development (SHENZHEN) co.,Ltd Model Difference 2022-12-07 EUT NAME: Wireless earphone MODEL : EW24, EW06, EW18, EW20, EW22, EW23, EW28, EW29, EW31, EW32, EW33, EW34, EW35, EW36, EW51, EW19 Plus, CES3 Pro, CES4 Pro, CES5 Pro, ES56 FCC ID: 2AX2T-EW24 All the model are the same circuit and RF module, only for model name and color. Regards Note： The only difference between the left and right ears of EUT is the location of the copper pillar, and the circuit is completely the same. The specific difference is shown in the figure below. Left Right Sincerely Client’s signature Client’s signature: Client’s name / title : ZHU WENFU / engineer Contact information / address: Rm 408, Block A, Weidonglong Business Building, 2125 Meilong Road, Tsinghua Community, Longhua Street, Longhua District, Shenzhen, China

Hoco technology development (SHENZHEN) co.,Ltd 2022.12.07 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: Wireless earphone Trademark: MODEL : EW24, EW06, EW18, EW20, EW22, EW23, EW28, EW29, EW31, EW32, EW33, EW34, EW35, EW36, EW51, EW19 Plus, CES3 Pro, CES4 Pro, CES5 Pro, ES56 FCC ID : 2AX2T-EW24 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 : ZHU WENFU / engineer Contact information / address: Rm 408, Block A, Weidonglong Business Building, 2125 Meilong Road, Tsinghua Community, Longhua Street, Longhua District, Shenzhen, China

Hoco technology development (SHENZHEN) co.,Ltd 2022.12.07 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 : ZHU WENFU / engineer Contact information / address: Rm 408, Block A, Weidonglong Business Building, 2125 Meilong Road, Tsinghua Community, Longhua Street, Longhua District, Shenzhen, China

External Photos

Size:10*5mm Wireless earphone FCC ID: 2AX2T-EW24 Label location Label location

Internal Photos Antenna Antenna

RF EXPOSURE EVALUATION METHOD FCC ID: 2AX2T-EW24 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 -0.791 21 GFSK Middle -1.153 21 GFSK High -1.667 21 π/ 4 DQPSK Low 0.044 21 π/ 4 DQPSK Middle -0.323 21 π/ 4 DQPSK High -0.839 21 max possible output power (PK,conducted)：0±1dBm 3dBi logarithmic terms convert to numeric result is nearly 2 1dBm=1.26mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 1.26/5*√2.402=0.391≤3.0 2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 1.26/5*√2.441=0.394≤3.0 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 1.26/5*√2.48=0.397≤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.

SymbolsLWTA Dimensions 1.60±0.200.80±0.200.80±0.200.30±0.10 NumberTerminalName ① INPUT ② NC Dimensions(Unit: mm) w ①② ( Side View) ( Bottom View) ( Top View) A T L HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page1 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. 12A11, Baoyunda Logistics Information Building, Qianjin Second Road, Bao 'an District, Shenzhen Tel: 0755-23069700 Fax: 0755-23069700 Applications 1.Bluetooth 2.WirelessLAN 3.ISM band 2.4GHz wirelessapplications Features 1.Surfacemounteddeviceswithasmalldimensionof1.6×0.8×0.8mmmeetfutureminiaturization trend. 2.EmbeddedandLTCC(lowtemperatureco-firedceramic)technologyisabletointegratewith systemdesignaswellasbeatifyingthehousingoffinalproduct. 3.Highstabilityandlowtolerance. P/N:HY160808 SRF07 MatchingCircuits P/N:HY160808 SRF07 12A11, Baoyunda Logistics Information Building, Qianjin Second Road, Bao 'an District, Shenzhen Tel: 0755-23069700 Fax: 0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page2 1 W=2 1 W2=2 1.5 Feeding line 2 5 0201/0402 footprint 0603 footprint 0201/0402 footprint 0.5 Unit:mm 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. 2 L=4 W1 ElectricalCharacteristics CharacteristicCurves FeatureSpecification 1 Centralfrequency 2.45GHz 2 Bandwidth>100MHz 3 Peak gain 4 VSWR<2 5 PolarizationLinear 6 AzimuthbeamwidthOmnidirectional 7 Impedance50Ω P/N:HY160808 SRF07 12A11, Baoyunda Logistics Information Building, Qianjin Second Road, Bao 'an District, Shenzhen Tel: 0755-23069700 Fax: 0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page 3 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. 3dBi RadiationPattern Y-ZPlane X-ZPlane coordinates： 12A11, Baoyunda Logistics Information Building, Qianjin Second Road, Bao 'an District, Shenzhen Tel: 0755-23069700 Fax: 0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page 4 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. P/N:HY160808 SRF07 3D RadiationPattern Frequency 2450MHz Avg.gain-0.85 Peakgain3.0 Efficiency82% 12A11, Baoyunda Logistics Information Building, Qianjin Second Road, Bao 'an District, Shenzhen Tel: 0755-23069700 Fax: 0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page 5 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. P/N:HY160808 SRF07 Temperature：40±2°C Humidity：90~95%RH Duration：500h Recovery conditions：Room temperature Recovery Time：24h (Class1) or 48h (Class2) Test Temperature Operating Temperature Temperature RelativeHumidity 25°C±3°C -25°C~+85°C 5~40°C 20~70% Notenoughsolder Weak holding forcemay cause bad connection between the chipandPCB. RecommendedSolderingAmounts The optimal solder fillet amounts forre-flowsoldering 天线厚度 以下 The optimal solder fillet amounts for wavesoldering DependabilityTest Too much solder Cracks tend to occur due to large stress. MoistureProof OptimumSolderAmount forReflowSoldering Solderability At least 95% of the terminal electrode is covered by newsolder. Preheating conditions:80 to 120°C;10~30s. Solder Tem p e r at u r e :2 3 5 ±5°C Duration:2 ±0.5s , Solder Tempe r ature:24 5±5°C Du rat ion:2±0.5s 12A11, Baoyunda Logistics Information Building, Qianjin Second Road, Bao 'an District, Shenzhen Tel: 0755-23069700 Fax: 0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page 6 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. P/N:HY160808 SRF07 10±1S AppliedForce:5NDuration:10±1S Preheating conditions: up-category temperature, 1h Recovery time:24±1h InitialMeasurement Cycling Times: 5 times, 1 cycle, 4steps: Preheating80to120°C;10~30s.SolderTemperature:235±5°C;Duration:2±0.5s;SolderTemperature:245±5°C Duration:2±0.5s;Preheating100to200°C;10±2min. SolderTemperature:265±5°C;Duration:10±1s Cleanthecapacitorwithsolventandexamineitwitha10X(min.)microscope. RecoveryTime:24±2h Recoverycondition:Roomtemperature Test Board: Al 2 O 3 orPCBWarp:1mm Speed:0.5mm/sec. Unit:mm Themeasurementshouldbemadewiththeboardinthe bendingposition. Resistance to Soldering Heat ResistancetoFlexureofSubstrate Temperature CycleTest 12A11, Baoyunda Logistics Information Building, Qianjin Second Road, Bao 'an District, Shenzhen Tel: 0755-23069700 Fax: 0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page 7 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. P/N:HY160808 SRF07 Whileinpreheating,pleasekeepthetemperaturedifferencebetweensolderingtemperatureandsurface temperatureofchipsas:T≤150°C. 12A11, Baoyunda Logistics Information Building, Qianjin Second Road, Bao 'an District, Shenzhen Tel: 0755-23069700 Fax: 0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd…

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Report No.: BCTC2211752508E No.：BCTC/RF-EMC-007 Page: 58 of 60 Edition：A.5 17. EUT Test Setup Photographs Conducted emissions Report No.: BCTC2211752508E No.：BCTC/RF-EMC-007 Page: 59 of 60 Edition：A.5 Radiated Measurement Photos