2ATOY-RT50ATRUE WIRELESS EARBUDS

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: -- Reorient or relocate the receiving antenna. -- Increase the separation between the equipment and receiver. -- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -- Consult the dealer or an experienced radio/TV technician for help. This device and its antenna(s) must not be co-located or operation in conjunction with any other antenna or transmitter. Radiation Exposure Statement The device has been evaluated to meet general RF exposure requirement. in portable exposure condition without restriction.

Dongguan Fulun Electronics Co.,Limited Add: 4-8/F, Building B, Xinbosheng Industrial Park, No.5 Xinyuan S Rd,Tangxia, Dongguan.CN Date: 2021-6-1 FCC ID: 2ATOY-RT50A Dear Sir/Madam, We, Dongguan Fulun Electronics Co.,Limited 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: TRUE WIRELESS EARBUDS Model no.: RT50A, D7646HD Sincerely, Name/Title： Bessie Luo/ Sales Manager Company: Dongguan Fulun Electronics Co.,Limited Address: 4-8/F, Building B, Xinbosheng Industrial Park, No.5 Xinyuan S Rd,Tangxia, Dongguan.CN Phone: +86-0755-25835499 Fax: +86-0755-25835499 E-Mail: [email protected]

CONFIDENTIALITY REQUEST for Certification Service in USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 Date: 2021/6/1 Pursuant to Paragraphs §0.457 and 0.459 of the Commission’s Rules (47 C.F.R.) and Section §552(b)(4) of the Freedom of Information Act, we requests confidentiality for the following products: FCC ID Model name 2ATOY-RT50A RT50A, D7646HD For the product stated above, we request that the following information be held confidential; Exhibits Long-Term Confidentiality Short-Term Confidentiality Short-Term Confidentiality Days External Photos Internal Photos Block Diagram Schematics Test Setup Photos User’s Manual Parts List Tune Up Operational Descriptions The long-term confidentiality exhibits contain our trade secrets and proprietary information that could be of benefit to our competitors. The short-term confidentiality on the basis of ensuring that business sensitive information remains confidential until the actual marketing of our new device. If you have any questions, please feel free to contact me at the address shown below. Sincerely, Name/Title： Bessie Luo/ Sales Manager Company: Dongguan Fulun Electronics Co.,Limited Address: 4-8/F, Building B, Xinbosheng Industrial Park, No.5 Xinyuan S Rd,Tangxia, Dongguan.CN Phone: +86-0755-25835499 Fax: +86-0755-25835499 E-Mail: [email protected]

Dongguan Fulun Electronics Co.,Limited 4-8/F, Building B, Xinbosheng Industrial Park, No.5 Xinyuan S Rd,Tangxia, Dongguan.CN Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 2021/6/1 To whom it may concern: We, Dongguan Fulun Electronics Co.,Limited the undersigned, hereby authorize Eurofins Product Service GmbH to act on our behalf in all matters relating to applications for equipment authorization FCC ID: 2ATOY-RT50A including the signing of all documents related to these matters. Any and all acts carried out by Eurofins Product Service GmbH on our behalf shall have the same effect as acts of our own. We also hereby certify that no party to this application is subject to a denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. Sincerely, Name/Title： Bessie Luo/ Sales Manager Company: Dongguan Fulun Electronics Co.,Limited Address: 4-8/F, Building B, Xinbosheng Industrial Park, No.5 Xinyuan S Rd,Tangxia, Dongguan.CN Phone: +86-0755-25835499 Fax: +86-0755-25835499 E-Mail: [email protected]

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 5 EXTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 5 Fig.3 Fig.4 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 5 Fig.5 Fig.6 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 4 of 5 Fig.7 Fig.8 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 5 of 5 - Fig.9

Size: 15mm(L)*10mm(W) Label Location: FCC ID: 2ATOY- RT50A

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 3 INTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 3 Fig.3 Fig.4 Bluetooth Antenna Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 3 Fig.5 Fig.6

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 2 RADIO FREQUENCY EXPOSURE Limit According to section 4.3.1 of KDB 447498 D01 General RF Exposure Guidance v06, SAR evaluation is required if the separation distance between the user and/or bystander and the antenna and/or radiating element of the device is less than or equal to 20 cm, except when the device operates at or below the applicable output power level (adjusted for tune-up tolerance) for the specified separation distance defined in Appendix A. Appendix A SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm MHz 5 10 15 20 25 mm 150 39 77 116 155 194 SAR Test Exclusion Threshold (mW) 300 27 55 82 110 137 450 22 45 67 89 112 835 16 33 49 66 82 900 16 32 47 63 79 1500 12 24 37 49 61 1900 11 22 33 44 54 2450 10 19 29 38 48 3600 8 16 24 32 40 5200 7 13 20 26 33 5400 6 13 19 26 32 5800 6 12 19 25 31 MHz 30 35 40 45 50 mm 150 232 271 310 349 387 SAR Test Exclusion Threshold (mW) 300 164 192 219 246 274 450 134 157 179 201 224 835 98 115 131 148 164 900 95 111 126 142 158 1500 73 86 98 110 122 1900 65 76 87 98 109 2450 57 67 77 86 96 3600 47 55 63 71 79 5200 39 46 53 59 66 5400 39 45 52 58 65 5800 37 44 50 56 62 Note: Manufacturer declared that the maximum antenna gain is 2.48dBi (Max.). Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 2 Conducted Power Results Test Mode Channel Frequency (MHz) Measured Peak Output Power (dBm) GFSK 00 2402 3.68 39 2441 2.84 78 2480 1.63 π/4-DQPSK 00 2402 5.98 39 2441 5.09 78 2480 3.80 8-DPSK 00 2402 6.49 39 2441 5.64 78 2480 4.29 Manufacturing tolerance GFSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) 3.5 2.5 1.5 Tolerance ±(dB) 1.0 1.0 1.0 π/4-DQPSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) 5.5 5.0 3.5 Tolerance ±(dB) 1.0 1.0 1.0 8-DPSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) 6.0 5.5 4.0 Tolerance ±(dB) 1.0 1.0 1.0 Results Test Mode Channel Frequency (MHz) Max. Tune Up Power (dBm, Peak) Max. Eirp including Tune Up (dBm, Peak) Max. Eirp including Tune Up (mW, Peak) Exemption Limit (mW) GFSK 2402 4.5 6.98 4.99 10 2441 3.5 5.98 3.96 10 2480 2.5 4.98 3.15 10 π/4-DQPSK 2402 6.5 8.98 7.91 10 2441 6.0 8.48 7.05 10 2480 4.5 6.98 4.99 10 8-DPSK 2402 7.0 9.48 8.87 10 2441 6.5 8.98 7.91 10 2480 5.0 7.48 5.60 10 The antenna gain of the EUT for BT is 2.48dBi (Max). the Maximum Eirp is used for Routine Evaluation Exemption according to section 4.3.1 of KDB 447498 D01. So, the SAR evaluation is not required.

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 1 of 35 Appendix A RF Test Data for BT(BDR/EDR) (Conducted Measurement) Product Name: TRUE WIRELESS EARBUDS Trade Mark: TZUMI, SOUNDMATES Test Model: RT50A FCC ID: 2ATOY-RT50A Environmental Conditions Temperature: 22.8 C Relative Humidity: 56% ATM Pressure: 100.0 kPa Test Engineer: Nancy Li Supervised by: Hugo Chen A.1 20 dB Bandwidth TestMode Antenna Channel 20db EBW[MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.885 2401.547 2402.432 --- PASS 2441 0.888 2440.544 2441.432 --- PASS 2480 0.888 2479.544 2480.432 --- PASS 2DH5 Ant1 2402 1.332 2401.334 2402.666 --- PASS 2441 1.332 2440.334 2441.666 --- PASS 2480 1.320 2479.337 2480.657 --- PASS 3DH5 Ant1 2402 1.188 2401.412 2402.600 --- PASS 2441 1.188 2440.412 2441.600 --- PASS 2480 1.239 2479.364 2480.603 --- PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 2 of 35 Test Graph DH5_Ant1_2402 DH5_Ant1_2441 DH5_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 3 of 35 2DH5_Ant1_2402 2DH5_Ant1_2441 2DH5_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 4 of 35 3DH5_Ant1_2402 3DH5_Ant1_2441 3DH5_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 5 of 35 A.2 Dwell Time TestMode Antenna Channel BurstWidth [ms] TotalHops [Num] Result[s] Limit[s] Verdict DH5 Ant1 Hop 2.90 120 0.348 <=0.4 PASS 2DH5 Ant1 Hop 2.91 70 0.203 <=0.4 PASS 3DH5 Ant1 Hop 2.91 110 0.32 <=0.4 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 6 of 35 Test Graph DH5_Ant1_Hop Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 7 of 35 2DH5_Ant1_Hop Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 8 of 35 3DH5_Ant1_Hop Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 9 of 35 A.3 Carrier Frequency Separation TestMode Antenna Channel Result[MHz] Limit[MHz] Verdict DH5 Ant1 Hop 1.156 >=0.888 PASS 2DH5 Ant1 Hop 1.006 >=0.888 PASS 3DH5 Ant1 Hop 0.998 >=0.826 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 10 of 35 Test Graph DH5_Ant1_Hop 2DH5_Ant1_Hop 3DH5_Ant1_Hop Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 11 of 35 A.4 Hopping Channel Number TestMode Antenna Channel Result[Num] Limit[Num] Verdict DH5 Ant1 Hop 79 >=15 PASS 2DH5 Ant1 Hop 79 >=15 PASS 3DH5 Ant1 Hop 79 >=15 PASS Test Graph DH5_Ant1_Hop 2DH5_Ant1_Hop Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 12 of 35 3DH5_Ant1_Hop Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 13 of 35 A.5 Conducted Peak Output Power TestMode Antenna Channel Result[dBm] Limit[dBm] Verdict DH5 Ant1 2402 3.68 <=20.97 PASS 2441 2.84 <=20.97 PASS 2480 1.63 <=20.97 PASS 2DH5 Ant1 2402 5.98 <=20.97 PASS 2441 5.09 <=20.97 PASS 2480 3.8 <=20.97 PASS 3DH5 Ant1 2402 6.49 <=20.97 PASS 2441 5.64 <=20.97 PASS 2480 4.29 <=20.97 PASS Test Graph DH5_Ant1_2402 DH5_Ant1_2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 14 of 35 DH5_Ant1_2480 2DH5_Ant1_2402 2DH5_Ant1_2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 15 of 35 2DH5_Ant1_2480 3DH5_Ant1_2402 3DH5_Ant1_2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 16 of 35 3DH5_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 17 of 35 A.6 Band-edge for RF Conducted Emissions TestMode Antenna ChName Channel RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 Low 2402 3.47 -48.36 <=-16.53 PASS High 2480 1.35 -47.75 <=-18.65 PASS Low Hop_2402 3.30 -49.02 <=-16.7 PASS High Hop_2480 1.33 -47.63 <=-18.67 PASS 2DH5 Ant1 Low 2402 3.37 -47.95 <=-16.63 PASS High 2480 1.50 -47.41 <=-18.5 PASS Low Hop_2402 1.81 -49.2 <=-18.19 PASS High Hop_2480 1.31 -47.71 <=-18.69 PASS 3DH5 Ant1 Low 2402 3.50 -48.43 <=-16.5 PASS High 2480 1.47 -47.82 <=-18.53 PASS Low Hop_2402 3.44 -48.61 <=-16.56 PASS High Hop_2480 2.40 -47.04 <=-17.6 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 18 of 35 Test Graph DH5_Ant1_Low_2402 DH5_Ant1_High_2480 DH5_Ant1_Low_Hop_2402 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 19 of 35 DH5_Ant1_High_Hop_2480 2DH5_Ant1_Low_2402 2DH5_Ant1_High_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 20 of 35 2DH5_Ant1_Low_Hop_2402 2DH5_Ant1_High_Hop_2480 3DH5_Ant1_Low_2402 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 21 of 35 3DH5_Ant1_High_2480 3DH5_Ant1_Low_Hop_2402 3DH5_Ant1_High_Hop_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 22 of 35 A.7 RF Conducted Spurious Emissions Test Graph DH5_Ant1_2402_0~Reference DH5_Ant1_2402_30~1000 DH5_Ant1_2402_1000~26500 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 23 of 35 DH5_Ant1_2441_0~Reference DH5_Ant1_2441_30~1000 DH5_Ant1_2441_1000~26500 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 24 of 35 DH5_Ant1_2480_0~Reference DH5_Ant1_2480_30~1000 DH5_Ant1_2480_1000~26500 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 25 of 35 2DH5_Ant1_2402_0~Reference 2DH5_Ant1_2402_30~1000 2DH5_Ant1_2402_1000~26500 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 26 of 35 2DH5_Ant1_2441_0~Reference 2DH5_Ant1_2441_30~1000 2DH5_Ant1_2441_1000~26500 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A Report No.: TZ210502223-E Page 27 of 35 2DH5_Ant1_2480_0~Reference 2DH5_Ant1_2480_30~1000 2DH5_Ant1_2480_1000~26500 Shenzhen To…

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Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ATOY-RT50A This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 1 TEST SETUP PHOTOS OF THE EUT Radiated Emission Below 1GHz Radiated Emission Above 1GHz