2AMBA-S83TWS Earbuds

Dongguan Pinmi Electronic Technology Co., Ltd. Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 [November 27, 2025] U.S. Agent Designation [Dongguan Pinmi Electronic Technology Co., Ltd.] acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment for which authorization is sought FCC ID: 2AMBA-S83 Name and company of U.S. agent: [GLOCERTS TECHNOLOGY INC] Physical U.S. address of agent: [19784 SUNKISSED RIDGE DR, RIVERSIDE, CA 92507] FRN of U.S. agent: [0036339737] Email address of U.S. agent: [[email protected]] Telephone of U.S.agent: (626) 588-8039 [GLOCERTS TECHNOLOGY INC] acknowledges their obligation to accept service of process on behalf of [Dongguan Pinmi Electronic Technology Co., Ltd.]. [Dongguan Pinmi Electronic Technology Co., Ltd.] with the FRN [0033640764] accepts its obligation to maintain an agent for service of process in the United States for no less than 1 year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(d)(7). The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. Sincerely, Signature Signature [Tang feitao] [Huiying Fan] [Manager] [Director] [Dongguan Pinmi Electronic Technology Co., Ltd.] [GLOCERTS TECHNOLOGY INC]

Dongguan Pinmi Electronic Technology Co., Ltd. (November 27, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for FCC ID: 2AMBA-S83 [Dongguan Pinmi Electronic Technology Co., Ltd.] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber-security or anti-virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, (Applicant signature) (Applicant printed name) Tang feitao Dongguan Pinmi Electronic Technology Co., Ltd. (November 27, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for FCC ID: 2AMBA-S83 [Dongguan Pinmi Electronic Technology Co., Ltd.] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) Tang feitao

Dongguan Pinmi Electronic Technology Co., Ltd. Model Difference Data：November 29, 2025 Product description: TWS Earbuds Model name: S83, S69A, S79A, S73B, S73C, S81, S81A, S82, S88, S88A, S89, S89A, S90, S90A, S91, S91A, S92, S92A, S93, S93A, S94, S94A, S95, S95A, S96, S96A, S97, S97A, S98, S98A, S99, S99A, S100, S100A, S101, S101A, S51, S52A, S53A, S66, S67, S67A, S68, S69, S71, S72, S73, S74A, S75, S76, S76A, S77, S77A, S78, S78A, S79, S80, S80A, S84, S84A, S85, S85A, S86, S86A, S87, S87A, VIBE Trade Name: N/A FCC ID: 2AMBA-S83 All the model are the same circuit and RF module, only the model names are different. Regards Sincerely Client’s signature : Client’s name / title : Tang feitao（Manager） Contact information / address： Room 201, No. 158, Shatong Road, Dalang Town, Dongguan, Guangdong, 52 3000 China

Dongguan Pinmi Electronic Technology Co., Ltd. (November 29, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (TWS Earbuds / S83, S69A, S79A, S73B, S73C, S81, S81A, S82, S88, S88A, S89, S89A, S90, S90A, S91, S91A, S92, S92A, S93, S93A, S94, S94A, S95, S95A, S96, S96A, S97, S97A, S98, S98A, S99, S99A, S100, S100A, S101, S101A, S51, S52A, S53A, S66, S67, S67A, S68, S69, S71, S72, S73, S74A, S75, S76, S76A, S77, S77A, S78, S78A, S79, S80, S80A, S84, S84A, S85, S85A, S86, S86A, S87, S87A, VIBE / FCC ID: 2AMBA-S83) 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 Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☒ Internal Photos ☐ NOTE 1 ☒ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No required to be submitted with this application be permanently withheld from public review. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Signature: Name: Tang feitao Title: Manager

Dongguan Pinmi Electronic Technology Co., Ltd. (November 27, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology 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, Signature: Name: Tang feitao Title: Manager

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 7 Model: S83 External Photos L Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 7 R Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 5 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 6 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 7 of 7

FCC ID LABEL: Label Location: FCC ID: 2AMBA-S83

Shenzhen CTB Testing Co., Ltd. FCC ID: 2AMBA-S83 Portable device According to §15.247(e)(i) and §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. According to KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR 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 When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. EDR: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 -0.282 0.94 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 -0.369 0.92 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 -1.718 0.67 -1±1 0.00 1.00 <5 0.31496 3.00 YES 2.402 0.52 1.13 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 0.303 1.07 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 -1.04 0.79 -1±1 0.00 1.00 <5 0.31496 3.00 YES GFSK π /4DQPSK BLE:1M Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 -0.376 0.92 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.44 -0.516 0.89 0±1 1.00 1.26 <5 0.39330 3.00 YES 2.480 -1.993 0.63 -1±1 0.00 1.00 <5 0.31496 3.00 YES GFSK BLE:2M Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 -0.303 0.930±11.001.26<50.390233.00YES 2.44 -0.382 0.920±11.001.26<50.393303.00YES 2.480 -1.816 0.66-1±10.001.00<50.314963.00YES GFSK Conclusion: For the max result : 0.39338≤ FCC Limit 3.0 for 1g SAR.

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 Shenzhen HanyangAntenna Design Co. Ltd. 1.Bluetooth 2.Dual-band WLAN 3.ISM and UWB 1.Surfacemountedelementwithasmalldimensionof1.6×0.8×0.8mmmeetfutureminiaturizationtrend. 2.EmbeddedandLTCC(lowtemperatureco-firedceramic)technologyisabletointegratewithsystemdesign aswellasbeatifyingthehousingoffinalproduct. 3.Miniaturization,wideband,highstability,lowESR,andlowtolerance. 4.Dual-bandresonancesinthedominantandharmonicmodesenablesmultibandoperations. 5.Novelground-radiationtechniqueenablesradiationfromboththeantennaandthegroundplane. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 Features: Applications: RF chip ANT chipANT pattern PCB ground Mode-2 Mode-1 P/N: HY160808 SRF09 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page1 Layout-1 (3.5mm×6.5mm) ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page2 1.5 1 3.5 2.5 0201 footprint (E1) 0201 footprint (E2) 0603 footprint (ANT) RF Input/Output 6.5 0.5 0.5 0.5 1.5 3.5 2.5 0201 footprint (E3) 6.5 Top layer: Bottom layer: 0.5 0.5 RF chip E1 E3 E2 ANT Equivalentcircuit: P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 2.5 0201 footprint 0603 footprint 10 0.5 1.5 0201 footprint 1.5 3 2.5 10 1.5 2 0.5 0201 footprint Layout-2 (1.5mm×10mm) Top layer: Bottom layer: P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page3 RF Input/Output ElectricalCharacteristics: CharacteristicCurves: FeatureSpecification 1 Centralfrequency2.45GHz 2 Bandwidth>150MHz 3 Peak gain2.78dBi 4 VSWR<2 5 PolarizationLinear 6 AzimuthbeamwidthOmnidirectional 7 Impedance50Ω P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page5 RadiationPattern: Y-ZPlaneX-ZPlane coordinates： 深圳市宝安区前进二路宝运达物流信息大厦12A10/12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page5 RadiationPerformance: P/N: HY160808 SRF07, HY160808 SRF08,HY160808 SRF09 深圳汉阳天线设计有限公司 Shenzhen Hanyang Antenna Design Co. Ltd. X-YPlane Frequency 2400MHz2450MHz2500MHz Avg.gain-1.92-1.35-1.56 Peakgain1.792.782.66 Efficiency74.5580.2576.98 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±5°C -25°C~+125°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°CDuration:2 ±0.5s , Solder Tempe r ature:24 5±5°CDu rat ion:2±0.5s P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page6 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 P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page7 StageTemperatur…

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Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 51 TEST REPORT Compiled by: Reviewed by: Approved by: Zhou Kui Arron Liu Bin Mei / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. 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 CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: TWS Earbuds FCC ID: 2AMBA-S83 Trademark: N/A Model Number: S83, S69A, S79A, S73B, S73C, S81, S81A, S82, S88, S88A, S89, S89A, S90, S90A, S91, S91A, S92, S92A, S93, S93A, S94, S94A, S95, S95A, S96, S96A, S97, S97A, S98, S98A, S99, S99A, S100, S100A, S101, A101A, S51, S52A, S53A, S66, S67, S67A, S68, S69, S71, S72, S73, S74A, S75, S76, S76A, S77, S77A, S78, S78A, S79, S80, S80A, S84, S84A, S85, S85A, S86, S86A, S87, S87A, VIBE Prepared For: Dongguan Pinmi Electronic Technology Co., Ltd. Address: Room 201, No. 158, Shatong Road, Dalang Town, Dongguan, Guangdong, 523 000 China Manufacturer: Dongguan Pinmi Electronic Technology Co., Ltd. Address: Room 201, No. 158, Shatong Road, Dalang Town, Dongguan, Guangdong, 523 000 China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Oct. 31, 2025 Sample tested Date: Oct. 31, 2025 to Nov. 10, 2025 Issue Date: Nov. 10, 2025 Report No.: CTB25103109003RF02 Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2020 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB25103109003RF02 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 51 TABLE OF CONTENT Test Report Declaration Page 1. VERSION ........................................................................................................................................................ 4 2. TEST SUMMARY .......................................................................................................................................... 5 3. MEASUREMENT UNCERTAINTY............................................................................................................. 6 4. PRODUCT INFORMATION AND TEST SETUP ..................................................................................... 7 4.1 Product Information .................................................................................................................................................... 7 4.2 Test Setup Configuration .......................................................................................................................................... 7 4.3 Support Equipment ..................................................................................................................................................... 7 4.4 Channel List .................................................................................................................................................................. 8 4.5 Test Mode ...................................................................................................................................................................... 8 4.6 Test Environment ........................................................................................................................................................ 8 5. TEST FACILITY AND TEST INSTRUMENT USED ................................................................................ 9 5.1 Test Facility ................................................................................................................................................................... 9 5.2 Test Instrument Used ................................................................................................................................................. 9 6. AC POWER LINE CONDUCTED EMISSION .......................................................................................... 12 6.1 Block Diagram Of Test Setup ................................................................................................................................ 12 6.2 Limit ............................................................................................................................................................................... 12 6.3 Test procedure ........................................................................................................................................................... 12 6.4 Test Result .................................................................................................................................................................. 14 7. RADIATED SPURIOUS EMISSION ........................................................................................................ 16 7.1 Block Diagram Of Test Setup ................................................................................................................................ 16 7.2 Limit ............................................................................................................................................................................... 16 7.3 Test procedure ........................................................................................................................................................... 17 7.4 Test Result ......................................................................................................................................................…

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Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 2 Model: S83 Radiated Emission Below 1G Above 1G Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 2 Conducted emissions