2BFD9-GT-50TWS Bluetooth headset

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Meizhou Shengjian Acoustic Technology Co., Ltd No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province, China 2.911 (d)(5)(i) Equipment Type Attestation v1.2 Section 2.911(d)(5)(i) Certification – Equipment Type Company name: Meizhou Shengjian Acoustic Technology Co., Ltd Address: No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province, China Product Name: TWS Bluetooth headset FCC ID: 2BFD9-GT-50 Model(s): GT-50, GT-46, GT-48, GT-52, GT-56, GT-58 2.911(d)(5)(i) Equipment Type We, Meizhou Shengjian Acoustic Technology Co., Ltd (“the applicant”) certify that the equipment for which authorization is sought through certification is not:  Prohibited from receiving an equipment authorization pursuant to § 2.903; of the FCC rules.  Identified as an equipment type in the “Covered List” NOTE 1 Yours sincerely, Date: 2024/6/4 Name: Chaodong Wu Title: / Company: Meizhou Shengjian Acoustic Technology Co., Ltd NOTE 1 “Covered List”; is the List of Equipment and Services Covered By Section 2 of The Secure Networks Act, available at https://www.fcc.gov/supplychain/coveredlist References; 1) 986446 D01 Covered Equipment v01 https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=325672 2) Federal Register document 2022-28263 published on 02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-national-security-threats-to-the-com munications-supply-chain-through-the

Meizhou Shengjian Acoustic Technology Co., Ltd No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province, China 2.911 (d)(5)(ii) Applicant Attestation v1.3 Section 2.911(d)(5)(ii) Certification – Applicant (Covered List ) Company name: Meizhou Shengjian Acoustic Technology Co., Ltd Address: No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province, China Product Name: TWS Bluetooth headset FCC ID: 2BFD9-GT-50 Model(s): GT-50, GT-46, GT-48, GT-52, GT-56, GT-58 2.911(d)(5)(ii) Applicant filing We, Meizhou Shengjian Acoustic Technology Co., Ltd (“the applicant”) certify that, as of the date of the filing of the application, the applicant is is not identified on the “Covered List” NOTE 1 , established pursuant to § 1.50002 of this chapter, as an entity producing covered communications equipment. Yours sincerely, Signature: Date: 2024/6/4 Name: Chaodong Wu Title: / Company: Meizhou Shengjian Acoustic Technology Co., Ltd NOTE 1 “Covered List”; is the List of Equipment and Services Covered By Section 2 of The Secure Networks Act, available at https://www.fcc.gov/supplychain/coveredlist References; 1) 986446 D01 Covered Equipment v01 https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=325672 2) Federal Register document 2022-28263 published on 02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-national-security-threats-to-the-com munications-supply-chain-through-the

Meizhou Shengjian Acoustic Technology Co., Ltd No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province, China Date: 2024/6/4 FCC ID: 2BFD9-GT-50 Dear Sir/Madam, We, Meizhou Shengjian Acoustic Technology Co., Ltd, Hereby declares the following statement for Federal Communications Commission, PCB board, circuit, structure and internal of these model(s) are the same, Only model number is different for these model: Product name: TWS Bluetooth headset Model no.: GT-50, GT-46, GT-48, GT-52, GT-56, GT-58 Sincerely, Name/Title： Chaodong Wu, / Company: Meizhou Shengjian Acoustic Technology Co., Ltd Address: No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province, China Phone: 8615322233968 Fax: 8615322233968 E-Mail: [email protected]

Meizhou Shengjian Acoustic Technology Co., Ltd No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province, China Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2024/6/4 Subject; Request for Confidentiality FCC ID: 2BFD9-GT-50 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Meizhou Shengjian Acoustic Technology Co., Ltd No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province, China Name: Chaodong Wu Title: /

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 4 EXTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 4 Fig.3 Fig.4 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 4 Fig.5 Fig.6 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 4 of 4 Fig.7 Fig.8

Label Location: FCC ID: 2BFD9-GT-50

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 3 RADIO FREQUENCY EXPOSURE Limit According to section B.4 of 447498 D04 Interim General RF Exposure Guidance v01 SAR-based thresholds are derived based on frequency, power, and separation distance of the RF source. The formula defines the thresholds in general for either available maximum time-averaged power or maximum time-averaged ERP, whichever is greater. If the ERP of a device is not easily determined, such as for a portable device with a small form factor, the applicant may use the available maximum time-averaged power exclusively if the device antenna or radiating structure does not exceed an electrical length of λ/4. As for devices with antennas of length greater than λ/4 where the gain is not well defined, but always less than that of a half-wave dipole (length λ/2), the available maximum time-averaged power generated by the device may be used in place of the maximum time-averaged ERP, where that value is not known. The separation distance is the smallest distance from any part of the antenna or radiating structure for all persons, during operation at the applicable ERP. In the case of mobile or portable devices, the separation distance is from the outer housing of the device where it is closest to the antenna. The SAR-based exemption formula of § 1.1307(b)(3)(i)(B), repeated here as Formula (B.2), applies for single fixed, mobile, and portable RF sources with available maximum time-averaged power or effective radiated power (ERP), whichever is greater, of less than or equal to the threshold Pth (mW). This method shall only be used at separation distances from 0.5 cm to 40 cm and at frequencies from 0.3 GHz to 6 GHz (inclusive). Pth is given by Formula (B.2). Where and f is in GHz, d is the separation distance (cm), and ERP 20cm is per Formula (B.1). Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 3 The example values shown in Table B.2 are for illustration only. Frequency (MHz) Distance (mm) 5 10 15 20 25 30 35 40 45 50 300 39 65 88 110 129 148 166 184 201 217 450 22 44 67 89 112 135 158 180 203 226 835 9 25 44 66 90 116 145 175 207 240 1900 3 12 26 44 66 92 122 157 195 236 2450 3 10 22 38 59 83 111 143 179 219 3600 2 8 18 32 49 71 96 125 158 195 5800 1 6 14 25 40 58 80 106 136 169 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 3 Conducted Power Results Test Mode Antenna Frequency[MHz] Result[dBm] DH5 Ant1 2402 -1.99 DH5 Ant1 2441 -0.92 DH5 Ant1 2480 -0.43 2DH5 Ant1 2402 -1.32 2DH5 Ant1 2441 -0.20 2DH5 Ant1 2480 0.33 Manufacturing tolerance GFSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -2.0 -1.0 -0.5 Tolerance ±(dB) 1 1 1 π/4-DQPSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -1.5 -0.5 0.0 Tolerance ±(dB) 1 1 1 Results Test Mode Max. Tune Up Power(dBm, Peak) Max. Erp including Tune Up (dBm, Peak) Max. Erp including Tune Up (mW, Peak) Exemption Limit(mW) GFSK 0.5 1.05 1.27 3 π/4-DQPSK 1.0 1.55 1.43 3 The antenna gain of the EUT for BT is 2.7dBi (Max). the Maximum Erp is used for Routine Evaluation Exemption according to B.4 of 447498 D04 Interim General RF Exposure Guidance v01. So, the SAR evaluation is not required.

2.4GHz 1608 Chip Antenna: RANT1608F245C01 _ Application: WLAN,802.11b/g,Bluetooth,WLAN,etc... Features SMD,highreliability,ultraImpact,Omni-directional... PartnumberInformation RANT1608F245C (A)(B)(C)(D)(E) ElectricalSpecificatio 01 (F) n DimensionandTerminalConfiguration No.TerminalName 1Feeding/GNG 2GND/Feeding (A)ProductTypeChipAntenna (B)SizeCode 1.6x0.8mm( ± 0.1mm) (C)MaterialHighKmaterial (D)Frequency2.4~2.5GHz (E)FeedingmodePIFA&SingleFeeding (F)AntennatypeType=01 WorkingFrequencyRange2400~2500MHz Bandwidth120MHz(Min.) PeakGain2.7dBi(Typ.) Impedance50Ohm Returnloss10dB(Min) PolarizationLinear AzimuthBeamwidthOmni-directional OperationTemperature( °C )-40~85 °C ResistancetoSolderingHeats 10sec.(@280 °C ) TerminationNi/Au(Leadless) Dimension(mm) L 1.60±0.10 W 0.80 ± 0.10 T 0.80 ± 0.10 Add:Room 707, Building F, Tongan Zhichuangyuan, xixiang street, Baoan District, Shenzhen. 2.4GHz 1608 Chip Antenna: RANT1608F245C01 _ 1 EvaluationBoardReference PCBDimensionAntennaLayoutReference Unit:mm ElectricalCharacteristics ReturnLoss&Radiation ELECTRICALCHARACTERISTICSS11 Radiation ElectricalCharacteristics Freque ncy EfficPercenGain 2400-1.6472.27%2.38 2450-1.3375.34%2.7 2500-1.5972.98%2.59 Add:Room 707, Building F, Tongan Zhichuangyuan, xixiang street, Baoan District, Shenzhen. 2.4GHz 1608 Chip Antenna: RANT1608F245C01 _ TapingSpecifications ReelandTapingSpecification ReelSpecification TYPESIZEABCD 16087”4K/Reel 4.0±0.5 4.0±213.5±0.5178±2 TappingSpecification PackagingTypeABWEFGHTψDP PaperType1608 1.90±0.203.50±0.208.0±0.201.75±0.103.5±0.054.0±0.102.0±0.050.75±0.10 1.50±0.10 4.0±0.1 Add:Room 707, Building F, Tongan Zhichuangyuan, xixiang street, Baoan District, Shenzhen. _ 2.4GHz 1608 Chip Antenna: RANT1608F245C01 Reliability Table TestItemProcedure Requirements CeramicType Remark (Reference) Electrical Characterization Fulfilltheelectrical specification UserSpec. Thermal Shock 1.Preconditioning: 50±10°C/1hr,thenkeepfor24±1hrsatroomtemp. 2.Initialmeasure:Spec:referInitialspec. 3.Rapidchangeoftemperaturetest: -30°Cto+85°C;100cycles; 15minutesatLowercategorytemperature; 15minutesatUppercategorytemperature. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 107 Temperature Cycling 1.Initialmeasure:Spec:referInitialspec. 2.100Cycles(-30°Cto+85°C),SoakMode=1(2Cycle/hours). 3.Measurementat24±2Hoursaftertestcondition. NoVisibleDamage. Fulfilltheelectrical specification. JESD22 JA104 HighTemperature Exposure 1.Initialmeasure:Spec:referInitialspec. 2.Unpowered;500hours@T=+85°C. 3.Measurementat24±2hoursaftertest. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 108 LowTemperature Storage 1.Initialmeasure:Spec:referInitialspec. 2.Unpowered:500hours@T=-30°C. 3.Measurementat24±2hoursaftertest. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 108 Solderability (SMDBottomSide) Dippingmethod: a.Temperature:235±5°C b.Dippingtime:3±0.5s Thesoldershouldcover over95%ofthecritical areaofbottomside. IEC60384-21/22 4.10 SolderingHeat Resistance (RSH) Preheatingtemperature:150±10°C. Preheatingtime:1~2min. Soldertemperature:260±5°C. Dippingtime:5±0.5s NoVisibleDamage.IEC60384-21/22 4.10 Vibration5g'sfor20min.,12cycleseachof3orientations Note:Use8"X5"PCB.031"thick7securepointson,onelong sideand2securepointsatcornersofoppositesides.Parts mountedwithin2"fromanysecurepoint.Testfrom10-2000 Hz. NoVisibleDamage.MIL-STD-202 Method204 Mechanical Shock Threeshocksineachdirectionshallbeappliedalongthethree mutuallyperpendicularaxesofthetestspecimen(18shocks) Peakvalue:1,500g’s Duration:0.5ms Velocitychange:15.4ft/s Waveform:Half-sine NoVisibleDamage.MIL-STD-202 Method213 Humidity Bias 1.Humidity:85%R.H.,Temperature:85±2°C. 2.Time:500±24hours. 3.Measurementat24±2hrsaftertestcondition. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 Method106 Add:Room 707, Building F, Tongan Zhichuangyuan, xixiang street, Baoan District, Shenzhen. 2.4GHz 3216 Chip Antenna: RANT1608F245C01 _ Board Flex (SMD) 1.Mountingmethod: IR-Reflow.PCBSize(L:100×W:40×T:1.6mm) 2.Applytheloadindirectionofthearrowuntilbendingreaches 2mm. NoVisibleDamage.AEC-Q200 005 AdhesionForceof1.8Kgfor60seconds.NoVisibleDamage Magnificationof20Xor greatermaybeemployed forinspectionofthe mechanicalintegrityofthe devicebodyterminalsand body/terminaljunction. AEC-Q200 006 Physical Dimension Anyapplicablemethodusingx10magnification,micrometers, calipers,gauges,contourprojectors,orothermeasuring equipment,capableofdeterminingtheactualspecimen dimensions. Inaccordancewith specification. JESD22 JB100 RevisionHistory RevisionDateContent 12019/03/01NewDatasheet 22020/02/22Add2Dradiationcharacteristic Add:Room 707, Building F, Tongan Zhichuangyuan, xixiang street, Baoan District, Shenzhen.

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 1 of 34 Appendix Test Data for BT(BDR/EDR) (Conducted Measurement) Product Name: TWS Bluetooth headset Trade Mark: N/A Test Model: GT-50 FCC ID: 2BFD9-GT-50 Environmental Conditions Temperature: #Temp. Relative Humidity: #Humidity ATM Pressure: 100.0 kPa Test Engineer: Allen Lai Supervised by: Hugo Chen NOTE N/A Appendix A: 20dB Emission Bandwidth Test Result TestMode Antenna Frequency[MHz] 20db EBW[MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 1.032 2401.478 2402.510 --- --- DH5 Ant1 2441 0.993 2440.511 2441.504 --- --- DH5 Ant1 2480 0.963 2479.538 2480.501 --- --- 2DH5 Ant1 2402 1.293 2401.370 2402.663 --- --- 2DH5 Ant1 2441 1.326 2440.340 2441.666 --- --- 2DH5 Ant1 2480 1.284 2479.373 2480.657 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 2 of 34 Test Graphs DH5-Ant1-2402 DH5-Ant1-2441 DH5-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 3 of 34 2DH5-Ant1-2402 2DH5-Ant1-2441 2DH5-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 4 of 34 Appendix B: Occupied Channel Bandwidth Test Result TestMode Antenna Frequency[MHz] OCB [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.90062 2401.5529 2402.4535 --- --- DH5 Ant1 2441 0.90260 2440.5587 2441.4613 --- --- DH5 Ant1 2480 0.87755 2479.5677 2480.4453 --- --- 2DH5 Ant1 2402 1.2050 2401.4048 2402.6098 --- --- 2DH5 Ant1 2441 1.1830 2440.4134 2441.5964 --- --- 2DH5 Ant1 2480 1.1921 2479.4071 2480.5992 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 5 of 34 Test Graphs DH5-Ant1-2402 DH5-Ant1-2441 DH5-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 6 of 34 2DH5-Ant1-2402 2DH5-Ant1-2441 2DH5-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 7 of 34 Appendix C: Maximum peak conducted output power Test Result Test Mode Antenna Frequency[MHz] Conducted Peak Power[dBm] Conducted Limit[dBm] Verdict DH5 Ant1 2402 -1.99 ≤20.97 PASS DH5 Ant1 2441 -0.92 ≤20.97 PASS DH5 Ant1 2480 -0.43 ≤20.97 PASS 2DH5 Ant1 2402 -1.32 ≤20.97 PASS 2DH5 Ant1 2441 -0.20 ≤20.97 PASS 2DH5 Ant1 2480 0.33 ≤20.97 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 8 of 34 Test Graphs DH5-Ant1-2402-PASS DH5-Ant1-2441-PASS DH5-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 9 of 34 2DH5-Ant1-2402-PASS 2DH5-Ant1-2441-PASS 2DH5-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 10 of 34 Appendix D: Carrier frequency separation Test Result TestMode Antenna Frequency[MHz] Result[MHz] Limit[MHz] Verdict DH5 Ant1 Hop 0.996 ≥0.688 PASS 2DH5 Ant1 Hop 1.114 ≥0.884 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 11 of 34 Test Graphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 12 of 34 Appendix E: Time of occupancy Test Result TestMode Antenna Frequency[MHz] BurstWidth [ms] TotalHops [Num] Result[s] Limit[s] Verdict DH5 Ant1 Hop 2.885 100 0.289 ≤0.4 PASS 2DH5 Ant1 Hop 2.891 130 0.376 ≤0.4 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 13 of 34 Test Graphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 14 of 34 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 15 of 34 Appendix F: Number of hopping channels Test Result TestMode Antenna Frequency[MHz] Result[Num] Limit[Num] Verdict DH5 Ant1 Hop 79 ≥15 PASS 2DH5 Ant1 Hop 79 ≥15 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 16 of 34 Test Graphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 17 of 34 Appendix G: Band edge measurements Test Result TestMode Antenna ChName Frequency[MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 Low 2402 -2.66 -50.31 ≤-22.66 PASS DH5 Ant1 High 2480 -3.74 -49.07 ≤-23.74 PASS DH5 Ant1 Low Hop_2402 -2.83 -50.71 ≤-22.83 PASS DH5 Ant1 High Hop_2480 -3.19 -48.77 ≤-23.19 PASS 2DH5 Ant1 Low 2402 -2.84 -49.95 ≤-22.84 PASS 2DH5 Ant1 High 2480 -3.63 -49.53 ≤-23.63 PASS 2DH5 Ant1 Low Hop_2402 -2.70 -50.52 ≤-22.7 PASS 2DH5 Ant1 High Hop_2480 -4.45 -48.79 ≤-24.45 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 18 of 34 Test Graphs DH5-Ant1-2402-PASS DH5-Ant1-2480-PASS DH5-Ant1-Hop_2402-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 19 of 34 DH5-Ant1-Hop_2480-PASS 2DH5-Ant1-2402-PASS 2DH5-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 20 of 34 2DH5-Ant1-Hop_2402-PASS 2DH5-Ant1-Hop_2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 Report No.: TZ240505649-BT Page 21 of 34 Appendix H: Conducted Spurious Emission Test Result TestMode Antenna Frequency[MHz] FreqRange [MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 2402 0~Reference -3.41 -3.41 --- PASS DH5 Ant1 2402 30~1000 -3.41 -62.66 ≤-23.41 PASS DH5 Ant1 2402 1000~26500 -3.41 -45.63 ≤-23.41 PASS DH5 Ant1 2441 0~Reference -3.01 -3.01 --- PASS DH5 Ant1 2441 30~1000 -3.01 -62.48 ≤-23.01 PASS DH5 Ant1 2441 1000~26500 -3.01 -42.28 ≤-23.01 PASS DH5 Ant1 2480 0~Reference -4.28 -4.28 --- PASS DH5 Ant1 2480 30~1000 -4.28 -62.86 ≤-24.28 PASS DH5 Ant1 2480 1000~26500 -4.28 -46.24 ≤-24.28 PASS 2DH5 Ant1 2402 0~Reference -2.68 -2.68 --- PASS 2DH5 Ant1 2402 30~1000 -2.68 -62.41 ≤-22.68 PASS 2DH5 Ant1 2402 1000~26500 -2.68 -45.41 ≤-22.68 PASS 2DH5 Ant1 2441 0~Reference -2.82 -2.82 --- PASS 2DH5 Ant1 2441 30~1000 -…

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Report No.: TZ240505649-BT Page 1 of 36 FCC TEST REPORT Test report On Behalf of Meizhou Shengjian Acoustic Technology Co., Ltd For TWS Bluetooth headset Model No.: GT-50, GT-46, GT-48, GT-52, GT-56, GT-58 FCC ID: 2BFD9-GT-50 Prepared for : Meizhou Shengjian Acoustic Technology Co., Ltd No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province Prepared By : Shenzhen Tongzhou Testing Co.,Ltd 1th Floor, Building 1, Haomai High-tech Park, Huating Road 387, Dalang Street, Longhua, Shenzhen, China Date of Test: 2024/5/28 ~ 2024/5/30 Date of Report: 2024/5/31 Report Number: TZ240505649-BT The test report apply only to the specific sample(s) tested under stated test conditions It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: TZ240505649-BT Page 2 of 36 TEST RESULT CERTIFICATION Applicant’s name ................. : Meizhou Shengjian Acoustic Technology Co., Ltd Address .................................. : No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province Manufacture's Name ............ : Meizhou Shengjian Acoustic Technology Co., Ltd Address .................................. : No.1, Eyi Village Committee, Ningzhong Town, Xingning City, Guangdong Province Product description Trade Mark ................................ : N/A Product name ............................ : TWS Bluetooth headset Model and/or type reference : GT-50, GT-46, GT-48, GT-52, GT-56, GT-58 Standards ............................. : FCC Rules and Regulations Part 15 Subpart C Section 15.247 ANSI C63.10: 2013 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen Tongzhou Testing Co.,Ltd is acknowledged as copyright owner and source of the material. Shenzhen Tongzhou Testing Co.,Ltd takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Date of Test ............................................ : Date (s) of performance of tests.............. : 2024/5/28 ~ 2024/5/30 Date of Issue ........................................... : 2024/5/31 Test Result .............................................. : Pass Testing Engineer : (Allen Lai) Technical Manager : (Hugo Chen) Authorized Signatory : (Andy Zhang) Report No.: TZ240505649-BT Page 3 of 36 Revision History Revision Issue Date Revisions Revised By 00 2024/5/31 Initial Issue Andy Zhang Report No.: TZ240505649-BT Page 4 of 36 TABLE OF CONTENTS 1 GENERAL INFORMATION ................................................................................................ 5 1.1 Description of Device (EUT) ...................................................................................................... 5 1.2 Wireless Funtion Tested in this Report ..................................................................................... 5 1.3 EUT configuration ..................................................................................................................... 6 1.4 External I/O and Cable .............................................................................................................. 6 1.5 Description of Test Facility ........................................................................................................ 6 1.6 Statement of the Measurement Uncertainty .............................................................................. 6 1.7 Measurement Uncertainty ......................................................................................................... 7 1.8 Description of Test Modes ........................................................................................................ 7 2 TEST METHODOLOGY ..................................................................................................... 8 2.1 EUT Configuration ..................................................................................................................... 8 2.2 EUT Exercise ............................................................................................................................ 8 2.3 Test Sample .............................................................................................................................. 8 3 SYSTEM TEST CONFIGURATION .................................................................................... 9 3.1 Justification ............................................................................................................................... 9 3.2 EUT Exercise Software ............................................................................................................. 9 3.3 Special Accessories .................................................................................................................. 9 3.4 Block Diagram/Schematics ....................................................................................................... 9 3.5 Equipment Modifications ........................................................................................................... 9 3.6 Test Setup ................................................................................................................................. 9 4 SUMMARY OF TEST RESULTS ...................................................................................... 10 5 MEASUREMENT RESULTS ............................................................................................ 11 5.1 Maximum Peak Conducted Output Power .............................................................................. 11 5.2 Frequency Separation and 20 dB Bandwidth .......................................................................... 12 5.3 Number of Hopping Frequency ............................................................................................... 13 5.4 Time of Occupancy (Dwell Time) ................................................…

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Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 2 TEST SETUP PHOTOS OF THE EUT Conducted Emission Radiated Emission Below 1GHz Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BFD9-GT-50 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 2 Radiated Emission Above 1GHz