2AKR3U-AIRTrue Wireless Earbuds

9 FCC Caution： 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. Any Changes or modifications 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. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Shenzhen XinZhengyu Technology Co.,Ltd 2020.5.06 Eurofins MET Labs 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR EUT NAME: True Wireless Earbuds Trademark: N/A FCC ID: 2AKR3U-AIR MODEL : U-Air, U-Air2, U-Air3, U-Air4, U-Air5, U-Air6, U-Air7, U-Air8, U89, U- pro, U-pro2, BTH92 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 : JunHua Wu /General Manager Contact information / address: 5F, 4 Building, Haitianlanyu Industrial Park, Shiyan Street, Bao'an District, Shenzhen City, China

Shenzhen XinZhengyu Technology Co.,Ltd 2020.5.6 Eurofins MET Labs 914 West Patapsco Avenue Baltimore, MD 21230 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 : JunHua Wu /General Manager Contact information / address: 5F, 4 Building, Haitianlanyu Industrial Park, Shiyan Street, Bao'an District, Shenzhen City, China

Shenzhen XinZhengyu Technology Co.,Ltd Model Difference 2020-05-06 EUT NAME: True Wireless Earbuds Trademark: N/A FCC ID: 2AKR3U-AIR MODEL : U-Air, U-Air2, U-Air3, U-Air4, U-Air5, U-Air6, U-Air7, U-Air8, U89, U-pro, U-pro2, BTH92 All the model are the same circuit and RF module, except model names. Regards Sincerely Client’s signature: Client’s name / title : JunHua Wu /General Manager Contact information / address: 5F, 4 Building, Haitianlanyu Industrial Park, Shiyan Street, Bao'an District, Shenzhen City, China

External Photos

10*5mm Label Location FCC ID: 2AKR3U-AIR

Internal Photos Antenna

Shenzhen BCTC Testing Co., Ltd. FCC ID: 2AKR3U-AIR 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. 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 GFSK2.4021.631.461±12.001.58<50.491273.00YES Pi/4 DQPSK 2.4022.761.892±13.002.00<50.618473.00YES 8DPSK2.4023.162.073±14.002.51<50.778603.00YES Conclusion: For the max result : 0.77860＜3.0, the SAR testing is not required.

Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2004000034E Test Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-007 Ver.：A.0 Page 1 of 69 FCC Part 15C Test Report FCC ID: 2AKR3U-AIR Product Name: True Wireless Earbuds Trademark: N/A Model Name : U-Air U-Air2, U-Air3, U-Air4, U-Air5, U-Air6, U-Air7, U-Air8, U89, U-pro, U-pro2, BTH92 Prepared For : Shenzhen XinZhengyu Technology Co.,Ltd Address : 5F, 4 Building, Haitianlanyu Industrial Park, Shiyan Street, Bao'an District, Shenzhen City, China Prepared By : Shenzhen BCTC Testing Co., Ltd. Address : BCTC Building & 1-2F, East of B Building, Pengzhou Industrial, Fuyuan 1st Road, Qiaotou Community, Fuyong Street, Bao’an District, Shenzhen, China Test Date: Apr. 02, 2020 – Apr. 23, 2020 Date of Report : Apr. 24, 2020 Report No.: BCTC2004000034E Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2004000034E Test Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-007 Ver.：A.0 Page 2 of 69 TEST RESULT CERTIFICATION Applicant’s name ............. : Shenzhen XinZhengyu Technology Co.,Ltd Address ............................. : 5F, 4 Building, Haitianlanyu Industrial Park, Shiyan Street, Bao'an District, Shenzhen City, China Manufacture's Name ........ : Shenzhen XinZhengyu Technology Co.,Ltd Address ............................. : 5F, 4 Building, Haitianlanyu Industrial Park, Shiyan Street, Bao'an District, Shenzhen City, China Product description Product name .................... : True Wireless Earbuds Trademark ......................... : N/A Model and/or type reference .......................................... : U-Air U-Air2, U-Air3, U-Air4, U-Air5, U-Air6, U-Air7, U-Air8, U89, U-pro, U-pro2, BTH92 Standards ......................... : FCC Part15.247 ANSI C63.10:2013 558074 D01 15.247 Meas Guidance v05r02 This device described above has been tested by BCTC, and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of BCTC, this document may be altered or revised by BCTC, personal only, and shall be noted in the revision of the document. Prepared by(Engineer): Cai Fang Zhong Reviewer(Supervisor): Eric Yang Approved(Manager): Zero Zhou Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2004000034E Test Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-007 Ver.：A.0 Page 3 of 69 Table of Contents Test Report Declaration Page 1. TEST SUMMARY ...................................................... 5 2. TEST FACILITY ....................................................... 6 3. MEASUREMENT UNCERTAINTY........................................ 6 4. GENERAL INFORMATION .............................................. 7 4.1 GENERAL DESCRIPTION OF EUT ...................................... 7 4.2 Test Setup Configuration ................................................ 7 4.3 Support Equipment ..................................................... 8 4.4 Channel List ........................................................... 9 4.5 Test Mode ............................................................ 10 5. TEST FACILITY AND TEST INSTRUMENT USED ........................ 11 5.1 Test Facility ........................................................... 11 5.2 Test Instrument Used .................................................. 11 6. CONDUCTED EMISSIONS ............................................. 13 6.1 Block Diagram Of Test Setup ........................................... 13 6.2 Limit ................................................................. 13 6.3 Test procedure ........................................................ 13 6.4 Test Result ........................................................... 15 7. RADIATED EMISSIONS ............................................... 17 7.1 Block Diagram Of Test Setup ........................................... 17 7.2 Limit ................................................................. 18 7.3 Test procedure ........................................................ 18 7.4 Test Result ........................................................... 20 7.5 RADIATED Band EMISSION MEASUREMENT ............................ 24 8. CONDUCTED EMISSION .............................................. 27 8.1 Block Diagram Of Test Setup ........................................... 27 8.2 Limit ................................................................. 27 8.3 Test procedure ........................................................ 27 8.4 Test Result ........................................................... 28 9. 20 DB BANDWIDTH .................................................. 37 9.1 Block Diagram Of Test Setup ........................................... 37 9.2 Limit ................................................................. 37 9.3 Test procedure ........................................................ 37 9.4 Test Result ........................................................... 38 10. MAXIMUM PEAK OUTPUT POWER .................................... 43 10.1 Block Diagram Of Test Setup .......................................... 43 10.2 Limit ................................................................ 43 10.3 Test procedure ....................................................... 43 10.4 Test Result .......................................................... 44 11. HOPPING CHANNEL SEPARATION .................................... 49 11.1 Block Diagram Of Test Setup .......................................... 49 11.2 Limit ................................................................ 49 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2004000034E Test Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-007 Ver.：A.0 Page 4 of 69 11.3 Test procedure ....................................................... 49 11.4 Test Result .............................................…

Text truncated - open the document above for the full version.

Shenzhen BCTC Testing Co., Ltd. Radiated Emission Shenzhen BCTC Testing Co., Ltd. Conducted emissions