2AVD2-W55BLUETOOTH HEADPHONE

* theapplicantmustdesignateacontactlocatedintheUnitedStatesforpurposesofactingasthe applicant’sagentforserviceofprocess,regardlessofwhethertheapplicantisadomesticorforeign entity.AnapplicantlocatedintheUnitedStatesmaydesignateitselfastheagentforserviceofprocess. SC5128002 U.S.AgentDesignationforServiceofProcess- CertificationAttestationLetter 11/29/2025 TO:FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 ATTN.:ReviewingEngineer FCCID:2AVD2-W55 FRNofapplicant:0036280543 Persection2.911(d)(7)oftheFCCrules,[ShenzhenMonsterCreativeTechnologyCo.,Ltd.] (“theapplicant”)certifiesthattheequipmentforwhichauthorizationissoughtisdesignatedto thefollowingU.S.agent*forserviceofprocess: CompanyName:GlobalProductServicesandConsultationLLC FCCRegistrationNumber(FRN):0033406703 PhysicalU.S.CompanyAddress:328WPalmAve.,Monrovia,CA91016,UnitedStates ContactPerson:MichaelChan Tel:+16263664358 AgentEmailAddress:[email protected] Theabovecontactpersonacceptstheobligationforserviceofprocess. Theapplicantacceptstomaintainanagentfornolessthanoneyearafterthegranteehas terminatedallmarketingandimportationortheconclusionofanyCommission-related proceedinginvolvingtheequipment. ApplicantSigned:AgentSigned(ifdifferentfromApplicant): Signed: Printedname:runlongwang Title:R&DManager CompanyName:ShenzhenMonsterCreative TechnologyCo.,Ltd. Address:Room1602,BuildingA,Fencheng ZhiguBuilding,XixiangStreet,Bao'anDistrict, Shenzhen,Guangdong,518126,China Signed: Printedname:MichaelChan Title:TechnicalDirector CompanyName:GlobalProductServicesand ConsultationLLC Date:12/12/2025 Date:11/29/2025

Shenzhen Monster Creative Technology Co., Ltd. (2025-11-29) 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: 2AVD2-W55) [Shenzhen Monster Creative 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, run long wang R & D Manager Shenzhen Monster Creative Technology Co., Ltd. Room 1602, Building A, Fencheng Zhigu Building, Xixiang Street, Bao 'an District, Shenzhen, Guangdong, 518126, China Shenzhen Monster Creative Technology Co., Ltd. (2025-11-29) 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: 2AVD2-W55) [Shenzhen Monster Creative 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, run long wang R & D Manager Shenzhen Monster Creative Technology Co., Ltd. Room 1602, Building A, Fencheng Zhigu Building, Xixiang Street, Bao 'an District, Shenzhen, Guangdong, 518126, China

External Photographs View of EUT-1 View of EUT-2 Page 2 of 11 View of EUT-3 View of EUT-4 Page 3 of 11 View of EUT-5 View of EUT-6 Page 4 of 11 View of EUT-7 View of EUT-8 Page 5 of 11 View of EUT-9 View of EUT-10 Page 6 of 11 R: View of EUT-11 View of EUT-12 Page 7 of 11 View of EUT-13 View of EUT-14 Page 8 of 11 View of EUT-15 View of EUT-16 Page 9 of 11 L: View of EUT-17 View of EUT-18 Page 10 of 11 View of EUT-19 View of EUT-20 Page 11 of 11 View of EUT-21 View of EUT-22

Location: Back side of the upper cover

Internal Photographs Internal View of EUT-1 Internal View of EUT-2 Page 2 of 11 Internal View of EUT-3 Internal View of EUT-4 Page 3 of 11 Internal View of EUT-5 Internal View of EUT-6 Page 4 of 11 Internal View of EUT-7 Internal View of EUT-8 Page 5 of 11 Internal View of EUT-9 Internal View of EUT-10 Page 6 of 11 Internal View of EUT-11 Internal View of EUT-12 Page 7 of 11 Internal View of EUT-13 R: Internal View of EUT-14 Page 8 of 11 Internal View of EUT-15 Internal View of EUT-16 Antenna Page 9 of 11 Internal View of EUT-17 Internal View of EUT-18 Page 10 of 11 L: Internal View of EUT-19 Internal View of EUT-20 Page 11 of 11 Internal View of EUT-21 Internal View of EUT-22

RF EXPOSURE EVALUATION EUT Specification FCC ID 2AVD2-W55 EUT Name BLUETOOTH HEADPHONE Model MH22273 Series Model MH22274, W55 Model Difference Note: Only the appearance color and model names differ. Antenna gain (Max) 2.78 dBi Operation Frequency 2402-2480MHz Classification Per Stipulated Test Standard §15.247(i), §2.1093 Modulation GFSK, π/4-DQPSK Max. output power 1.21 dBm(1.321mW) Test Requirement: According to ß15.247(i) and ß1.1307(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. Routine SAR evaluation refers to that specifically required by ß2.1093, using measurements or computer simulation. When routine SAR evaluation is not required, portable transmitters with output power greater than the applicable low threshold require SAR evaluation to quality for TCB approval. One antenna is available for the EUT. The minimum separation distance is 5mm. Transmit Frequency (MHz) Mode Measured Power (dBm) Tune up Power (dBm) Max tune up power(dBm) Calculation Result 1-g SAR Verdict 2441 3DH5 1.21 1±1 2 0.495238 3 PASS Note: No need for SAR test Signature: Shawn Wen Date: 2025-10-11

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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TRF No.: 04-E001-0B TRF Originator: GTG TRF Date: 2023-12-13 Web: www.gtggroup.com E-mail: [email protected] Tel.: 86-400 755 8988 CFR 47 FCC PART 15 SUBPART C TEST REPORT For BLUETOOTH HEADPHONE MODEL NUMBER: MH22273, MH22274, W55 REPORT NUMBER: E04A25091047F00501 ISSUE DATE: October 11, 2025 FCC ID: 2AVD2-W55 Prepared for Shenzhen Monster Creative Technology Co., Ltd. Room 1602, Building A, Fencheng Zhigu Building, Xixiang Street, Bao 'an District, Shenzhen, Guangdong, 518126, China Prepared by Guangdong Global Testing Technology Co., Ltd. Room 101-105, 203-210, Building 1, No.2, Keji 8 Road, Songshan Lake Park, Dongguan city, Guangdong, People’s Republic of China, 523808 This report is based on a single evaluation of the submitted sample(s) of the above mentioned product, it does not imply an assessment of the production of the products. This report shall not be reproduced, except in full, without the written approval of Guangdong Global Testing Technology Co., Ltd. REPORT NO.: E04A25091047F00501 Page 2 of 83 TRF No.: 04-E001-0B Global Testing , Great Quality. Revision History Rev. Issue Date Revisions Revised By V0 October 11, 2025 Initial Issue REPORT NO.: E04A25091047F00501 Page 3 of 83 TRF No.: 04-E001-0B Global Testing , Great Quality. Summary of Test Results Test Item Clause Limit/Requirement Result Antenna Requirement ANSI C63.10-2020 FCC Part 15.203/15.247 (c) Pass AC Power Line Conducted Emission ANSI C63.10-2020 FCC Part 15.207 Pass Conducted Output Power ANSI C63.10-2020 FCC Part 15.247 (b)(1) Pass 20 dB Bandwidth ANSI C63.10-2020 FCC Part 15.247 (a)(1) Pass Carrier Hopping Channel Separation ANSI C63.10-2020 FCC Part 15.247 (a)(1) Pass Number of Hopping Frequency ANSI C63.10-2020 FCC Part 15.247 (b)(1) Pass Time of Occupancy (Dwell Time) ANSI C63.10-2020 FCC Part 15.247 (a)(1) Pass Conducted Bandedge and Spurious Emission ANSI C63.10-2020 FCC Part 15.247(d) Pass Radiated Band edge and Spurious Emission ANSI C63.10-2020 FCC Part 15.205/15.209 Pass Duty Cycle ANSI C63.10-2020 None; for reporting purposes only. Pass Note: 1. N/A: In this whole report not applicable. *This test report is only published to and used by the applicant, and it is not for evidence purpose in China. *The measurement result for the sample received is <Pass> according to <CFR 47 FCC PART 15 SUBPART C> when <Accuracy Method> decision rule is applied. REPORT NO.: E04A25091047F00501 Page 4 of 83 TRF No.: 04-E001-0B Global Testing , Great Quality. CONTENTS 1. ATTESTATION OF TEST RESULTS ..................................................................................... 5 2. TEST METHODOLOGY ......................................................................................................... 6 3. FACILITIES AND ACCREDITATION ..................................................................................... 6 4. CALIBRATION AND UNCERTAINTY ................................................................................... 7 4.1. MEASURING INSTRUMENT CALIBRATION ........................................................... 7 4.2. MEASUREMENT UNCERTAINTY ............................................................................ 7 5. EQUIPMENT UNDER TEST .................................................................................................. 8 5.1. DESCRIPTION OF EUT ........................................................................................... 8 5.2. CHANNEL LIST ........................................................................................................ 8 5.3. MAXIMUM PEAK OUTPUT POWER ........................................................................ 9 5.4. TEST CHANNEL CONFIGURATION ........................................................................ 9 5.5. THE WORSE CASE POWER SETTING PARAMETER ............................................ 9 5.6. DESCRIPTION OF AVAILABLE ANTENNAS ......................................................... 10 5.7. SUPPORT UNITS FOR SYSTEM TEST ................................................................. 10 5.8. SETUP DIAGRAM .................................................................................................. 11 6. MEASURING EQUIPMENT AND SOFTWARE USED......................................................... 12 7. ANTENNA PORT TEST RESULTS ..................................................................................... 14 7.1. Conducted Output Power ........................................................................................ 14 7.2. 20 dB Bandwidth ..................................................................................................... 15 7.3. Carrier Hopping Channel Separation ...................................................................... 16 7.4. Number of Hopping Frequency ............................................................................... 18 7.5. Time of Occupancy (Dwell Time) ............................................................................ 19 7.6. Conducted Bandedge and Spurious Emission ........................................................ 21 7.7. Duty Cycle .............................................................................................................. 23 8. RADIATED TEST RESULTS ............................................................................................... 24 8.1. Radiated Band edge and Spurious Emission .......................................................... 30 9. ANTENNA REQUIREMENT ................................................................................................ 42 10. AC POWER LINE CONDUCTED EMISSION ......................................................... 43 11. TEST DATA - Appendix A ..................................................................................... 46 REPORT NO.: E04A25091047F00501 Page 5 of 83 TRF No.: 04-E001-0B Global Testing , Great Quality. 1. ATTESTATION OF TEST RESULTS Applicant Information Company Name: Shenzhen Monster Creative Technology Co., Ltd. Add…

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Setup Photographs AC Power Line Conducted Emission Radiated Band edge and Spurious Emission Page 2 of 3 Page 3 of 3