2APMJAIRBUDSTWS bluetooth headset

Shenzhen DOKE Electronic Co., Ltd. Family models difference declaration TWS bluetooth headset Model: AirBuds 1, AirBuds 2 Difference declaration: All the model are the same circuit and RF module, except the color. And The charging boxes of the two TWS bluetooth headsets are different. AirBuds 1 corresponds to black charging box, and AirBuds 2 is the white charging box. Regards, Signature Aiting Yin / Manager Date: 2020-12-17

Shenzhen DOKE Electronic Co., Ltd Long Term Confidentiality Request Letter (2020-12-17) MET Laboratories, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR Product: TWS bluetooth headset Model No.: AirBuds 1, AirBuds 2 FCC ID: 2APMJAIRBUDS 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  Schematic Diagram  Block Diagram  Operational Description 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. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Please contact me if there is any information you may need. Sincerely, Aiting Yin / Manager Date/City: 2020-12-17/Shenzhen Phone: 18124004099 Fax: 0755-6668278 E-mail: [email protected]

Shenzhen DOKE Electronic Co., Ltd Short Term Confidentiality Request Letter (2020-12-17) MET Laboratories, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Short Term Confidentiality Request For Product: TWS bluetooth headset Model No.: AirBuds 1, AirBuds 2 FCC ID: 2APMJAIRBUDS To Whom It May Concern: In accordance with sections 0.457 and 0.459 of CFR 47, < Shenzhen DOKE Electronic Co., Ltd >. requests short-term Confidentiality of following sections of this application for a period of 03/08/2021 after grant is issued. Test setup photos External photos Internal photos User’s manual These documents contain detailed system and equipment descriptions and related information about the product, which < Shenzhen DOKE Electronic Co., Ltd > considers to be proprietary, confidential, and a custom design and otherwise, would not release to the general public. Since this design is a basis from which future technological products will evolve, < Shenzhen DOKE Electronic Co., Ltd > feels that this information would be of benefit to its competitors, and that the disclosure of the information in these documents would give our competitors an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Aiting Yin / Manager Date/City: 2020-12-17/Shenzhen Phone: 18124004099 Fax: 0755-6668278 E-mail: [email protected]

STR201120001 Model: AirBuds 1 Photo 1 AirBuds 1 Photo 2 AirBuds 2 STR201120001 Model: AirBuds 1 Photo 3 Photo 4 STR201120001 Model: AirBuds 1 Photo 5 Photo 6 STR201120001 Model: AirBuds 1 Photo 7 Photo 8 STR201120001 Model: AirBuds 1 Photo 9 Photo 10 STR201120001 Model: AirBuds 1 Photo 11 Photo 12 STR201120001 Model: AirBuds 1 Photo 13 Photo 14

FCC ID: 2APMJAIRBUDS 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. BT: Left 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 6.714.697±186.31<51.955763.00YES 2.441 6.384.357±186.31<51.971583.00YES 2.480 6.514.487±186.31<51.987273.00YES 2.402 6.584.557±186.31<51.955763.00YES 2.441 6.354.327±186.31<51.971583.00YES 2.480 6.474.447±186.31<51.987273.00YES 2.402 6.734.717±186.31<51.955763.00YES 2.441 6.374.347±186.31<51.971583.00YES 2.480 6.544.517±186.31<51.987273.00YES GFSK π/4- DQPSK 8-DPSK BLE: Left 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 2.4022.47 1.771±121.58<50.491273.00YES 2.4401.97 1.571±121.58<50.495143.00YES 2.4802.12 1.631±121.58<50.499183.00YES GFSK （1M） BT: Right 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 6.654.627±186.31<51.955763.00YES 2.441 6.364.337±186.31<51.971583.00YES 2.480 6.524.497±186.31<51.987273.00YES 2.402 6.584.557±186.31<51.955763.00YES 2.441 6.354.327±186.31<51.971583.00YES 2.480 6.484.457±186.31<51.987273.00YES 2.402 6.614.587±186.31<51.955763.00YES 2.441 6.334.307±186.31<51.971583.00YES 2.480 6.444.417±186.31<51.987273.00YES GFSK π/4- DQPSK 8-DPSK BLE: Right 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 2.4022.48 1.772±132.00<50.618473.00YES 2.4401.94 1.562±132.00<50.623343.00YES 2.4802.11 1.632±132.00<50.628433.00YES GFSK (1M) Conclusion: For the max result : 1.98727 ≤ 3.0 for 1g SAR, No SAR is required. Signature: Date: 2020-12-17 NAME AND TITLE (Please print or type): Alex li /Manager COMPANY (Please print or type): Shenzhen NTEK Testing Technology Co., Ltd./ 1/F, Building E, Fenda Science Park, Sanwei Community, Xixiang Street Bao’an District, Shenzhen P.R. China.

Report No.: STR201120002001E Version.1.2 Page 1 of 129 RADIO TEST REPORT FCC ID: 2APMJAIRBUDS Product: TWS bluetooth headset Trade Mark: Blackview Model No.: AirBuds 1 Family Model: AirBuds 2 Report No.: STR201120002001E Issue Date: 07 Dec.2020 Prepared for Shenzhen DOKE Electronic Co., Ltd 13th Floor, Weidonglong commercial building B, Meilong avenue, Longhua New District, Shenzhen, China Prepared by Shenzhen NTEK Testing Technology Co., Ltd. 1/F, Building E, Fenda Science Park, Sanwei Community, Xixiang Street Bao’an District, Shenzhen 518126 P.R. China Tel:400-800-6106 , 0755-3699-5508 Website:http://www.ntek.org.cn Report No.: STR201120002001E Version.1.2 Page 2 of 129 TABLE OF CONTENTS 1 TEST RESULT CERTIFICATION ...................................................................................................................... 3 2 SUMMARY OF TEST RESULTS ......................................................................................................................... 4 3 FACILITIES AND ACCREDITATIONS ............................................................................................................. 5 3.1 FACILITIES..................................................................................................................................................... 5 3.2 LABORATORY ACCREDITATIONS AND LISTINGS ................................................................................. 5 3.3 MEASUREMENT UNCERTAINTY ............................................................................................................... 5 4 GENERAL DESCRIPTION OF EUT .................................................................................................................. 6 5 DESCRIPTION OF TEST MODES ..................................................................................................................... 8 6 SETUP OF EQUIPMENT UNDER TEST ........................................................................................................... 9 6.1 BLOCK DIAGRAM CONFIGURATION OF TEST SYSTEM ....................................................................... 9 6.2 SUPPORT EQUIPMENT............................................................................................................................... 10 6.3 EQUIPMENTS LIST FOR ALL TEST ITEMS .............................................................................................. 11 7 TEST REQUIREMENTS .................................................................................................................................... 13 7.1 CONDUCTED EMISSIONS TEST ............................................................................................................... 13 7.2 RADIATED SPURIOUS EMISSION ............................................................................................................ 18 7.3 NUMBER OF HOPPING CHANNEL ........................................................................................................... 31 7.4 HOPPING CHANNEL SEPARATION MEASUREMENT ........................................................................... 32 7.5 AVERAGE TIME OF OCCUPANCY (DWELL TIME) ................................................................................ 34 7.6 20DB BANDWIDTH TEST .......................................................................................................................... 36 7.7 PEAK OUTPUT POWER .............................................................................................................................. 38 7.8 CONDUCTED BAND EDGE MEASUREMENT......................................................................................... 40 7.9 SPURIOUS RF CONDUCTED EMISSION .................................................................................................. 42 7.10 ANTENNA APPLICATION .......................................................................................................................... 43 8 TEST RESULTS ................................................................................................................................................... 44 8.1 DWELL TIME ................................................................................................................................................... 44 8.2 MAXIMUM CONDUCTED OUTPUT POWER ....................................................................................................... 54 8.3 OCCUPIED CHANNEL BANDWIDTH .................................................................................................................. 64 8.4 CARRIER FREQUENCIES SEPARATION .............................................................................................................. 74 8.5 NUMBER OF HOPPING CHANNEL ..................................................................................................................... 84 8.6 BAND EDGE .................................................................................................................................................... 86 8.7 CONDUCTED RF SPURIOUS EMISSION ........................................................................................................... 111 Report No.: STR201120002001E Version.1.2 Page 3 of 129 1 TEST RESULT CERTIFICATION Applicant's Name .................... : Shenzhen DOKE Electronic Co., Ltd Address ..................................... : 13th Floor, Weidonglong commercial building B, Meilong avenue, Longhua New District, Shenzhen, China Manufacturer's Name ............. : Shenzhen Antesin Technology Co. LTD Address ..................................... : 4F, fuxingda Industrial Park, 2 Lanjing North Road, Zhukeng community, Longtian street, Pingshan District, Shenzhen Product description Product name .............................. : TWS bluetooth headset Model and/or type reference ...... : AirBuds 1 Family Model ............................... : AirBuds 2 Measurement Procedure Used: APPLICABLE STANDARDS STANDA…

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Report No.: STR201120002001E Version.1.2 Page 86 of 129 8.6 BAND EDGE Left Condition Mode Frequency (MHz) Antenna Hopping Mode Max Value (dBc) Limit (dBc) Verdict NVNT 1-DH5 2402 Ant 1 No-Hopping -48 -20 Pass NVNT 1-DH5 2402 Ant 1 Hopping -47.35 -20 Pass NVNT 1-DH5 2480 Ant 1 No-Hopping -48.13 -20 Pass NVNT 1-DH5 2480 Ant 1 Hopping -47.57 -20 Pass NVNT 2-DH5 2402 Ant 1 No-Hopping -47.16 -20 Pass NVNT 2-DH5 2402 Ant 1 Hopping -46.28 -20 Pass NVNT 2-DH5 2480 Ant 1 No-Hopping -48.88 -20 Pass NVNT 2-DH5 2480 Ant 1 Hopping -48.44 -20 Pass NVNT 3-DH5 2402 Ant 1 No-Hopping -47.34 -20 Pass NVNT 3-DH5 2402 Ant 1 Hopping -47.26 -20 Pass NVNT 3-DH5 2480 Ant 1 No-Hopping -48.1 -20 Pass NVNT 3-DH5 2480 Ant 1 Hopping -48.27 -20 Pass Band Edge NVNT 1-DH5 2402MHz Ant1 No-Hopping Ref Report No.: STR201120002001E Version.1.2 Page 87 of 129 Band Edge NVNT 1-DH5 2402MHz Ant1 No-Hopping Emission Band Edge(Hopping) NVNT 1-DH5 2402MHz Ant1 Hopping Ref Report No.: STR201120002001E Version.1.2 Page 88 of 129 Band Edge(Hopping) NVNT 1-DH5 2402MHz Ant1 Hopping Emission Band Edge NVNT 1-DH5 2480MHz Ant1 No-Hopping Ref Report No.: STR201120002001E Version.1.2 Page 89 of 129 Band Edge NVNT 1-DH5 2480MHz Ant1 No-Hopping Emission Band Edge(Hopping) NVNT 1-DH5 2480MHz Ant1 Hopping Ref Report No.: STR201120002001E Version.1.2 Page 90 of 129 Band Edge(Hopping) NVNT 1-DH5 2480MHz Ant1 Hopping Emission Band Edge NVNT 2-DH5 2402MHz Ant1 No-Hopping Ref Report No.: STR201120002001E Version.1.2 Page 91 of 129 Band Edge NVNT 2-DH5 2402MHz Ant1 No-Hopping Emission Band Edge(Hopping) NVNT 2-DH5 2402MHz Ant1 Hopping Ref Report No.: STR201120002001E Version.1.2 Page 92 of 129 Band Edge(Hopping) NVNT 2-DH5 2402MHz Ant1 Hopping Emission Band Edge NVNT 2-DH5 2480MHz Ant1 No-Hopping Ref Report No.: STR201120002001E Version.1.2 Page 93 of 129 Band Edge NVNT 2-DH5 2480MHz Ant1 No-Hopping Emission Band Edge(Hopping) NVNT 2-DH5 2480MHz Ant1 Hopping Ref Report No.: STR201120002001E Version.1.2 Page 94 of 129 Band Edge(Hopping) NVNT 2-DH5 2480MHz Ant1 Hopping Emission Band Edge NVNT 3-DH5 2402MHz Ant1 No-Hopping Ref Report No.: STR201120002001E Version.1.2 Page 95 of 129 Band Edge NVNT 3-DH5 2402MHz Ant1 No-Hopping Emission Band Edge(Hopping) NVNT 3-DH5 2402MHz Ant1 Hopping Ref Report No.: STR201120002001E Version.1.2 Page 96 of 129 Band Edge(Hopping) NVNT 3-DH5 2402MHz Ant1 Hopping Emission Band Edge NVNT 3-DH5 2480MHz Ant1 No-Hopping Ref Report No.: STR201120002001E Version.1.2 Page 97 of 129 Band Edge NVNT 3-DH5 2480MHz Ant1 No-Hopping Emission Band Edge(Hopping) NVNT 3-DH5 2480MHz Ant1 Hopping Ref Report No.: STR201120002001E Version.1.2 Page 98 of 129 Band Edge(Hopping) NVNT 3-DH5 2480MHz Ant1 Hopping Emission Right Condition Mode Frequency (MHz) Antenna Hopping Mode Max Value (dBc) Limit (dBc) Verdict NVNT 1-DH5 2402 Ant 1 No-Hopping -48.27 -20 Pass NVNT 1-DH5 2402 Ant 1 Hopping -46.78 -20 Pass NVNT 1-DH5 2480 Ant 1 No-Hopping -49.18 -20 Pass NVNT 1-DH5 2480 Ant 1 Hopping -49.13 -20 Pass NVNT 2-DH5 2402 Ant 1 No-Hopping -47.51 -20 Pass NVNT 2-DH5 2402 Ant 1 Hopping -47.18 -20 Pass NVNT 2-DH5 2480 Ant 1 No-Hopping -49.1 -20 Pass NVNT 2-DH5 2480 Ant 1 Hopping -48.31 -20 Pass NVNT 3-DH5 2402 Ant 1 No-Hopping -47.68 -20 Pass NVNT 3-DH5 2402 Ant 1 Hopping -47.24 -20 Pass NVNT 3-DH5 2480 Ant 1 No-Hopping -49.2 -20 Pass NVNT 3-DH5 2480 Ant 1 Hopping -48.78 -20 Pass Report No.: STR201120002001E Version.1.2 Page 99 of 129 Band Edge NVNT 1-DH5 2402MHz Ant1 No-Hopping Ref Band Edge NVNT 1-DH5 2402MHz Ant1 No-Hopping Emission Report No.: STR201120002001E Version.1.2 Page 100 of 129 Band Edge(Hopping) NVNT 1-DH5 2402MHz Ant1 Hopping Ref Band Edge(Hopping) NVNT 1-DH5 2402MHz Ant1 Hopping Emission Report No.: STR201120002001E Version.1.2 Page 101 of 129 Band Edge NVNT 1-DH5 2480MHz Ant1 No-Hopping Ref Band Edge NVNT 1-DH5 2480MHz Ant1 No-Hopping Emission Report No.: STR201120002001E Version.1.2 Page 102 of 129 Band Edge(Hopping) NVNT 1-DH5 2480MHz Ant1 Hopping Ref Band Edge(Hopping) NVNT 1-DH5 2480MHz Ant1 Hopping Emission Report No.: STR201120002001E Version.1.2 Page 103 of 129 Band Edge NVNT 2-DH5 2402MHz Ant1 No-Hopping Ref Band Edge NVNT 2-DH5 2402MHz Ant1 No-Hopping Emission Report No.: STR201120002001E Version.1.2 Page 104 of 129 Band Edge(Hopping) NVNT 2-DH5 2402MHz Ant1 Hopping Ref Band Edge(Hopping) NVNT 2-DH5 2402MHz Ant1 Hopping Emission Report No.: STR201120002001E Version.1.2 Page 105 of 129 Band Edge NVNT 2-DH5 2480MHz Ant1 No-Hopping Ref Band Edge NVNT 2-DH5 2480MHz Ant1 No-Hopping Emission Report No.: STR201120002001E Version.1.2 Page 106 of 129 Band Edge(Hopping) NVNT 2-DH5 2480MHz Ant1 Hopping Ref Band Edge(Hopping) NVNT 2-DH5 2480MHz Ant1 Hopping Emission Report No.: STR201120002001E Version.1.2 Page 107 of 129 Band Edge NVNT 3-DH5 2402MHz Ant1 No-Hopping Ref Band Edge NVNT 3-DH5 2402MHz Ant1 No-Hopping Emission Report No.: STR201120002001E Version.1.2 Page 108 of 129 Band Edge(Hopping) NVNT 3-DH5 2402MHz Ant1 Hopping Ref Band Edge(Hopping) NVNT 3-DH5 2402MHz Ant1 Hopping Emission Report No.: STR201120002001E Version.1.2 Page 109 of 129 Band Edge NVNT 3-DH5 2480MHz Ant1 No-Hopping Ref Band Edge NVNT 3-DH5 2480MHz Ant1 No-Hopping Emission Report No.: STR201120002001E Version.1.2 Page 110 of 129 Band Edge(Hopping) NVNT 3-DH5 2480MHz Ant1 Hopping Ref Band Edge(Hopping) NVNT 3-DH5 2480MHz Ant1 Hopping Emission Report No.: STR201120002001E Version.1.2 Page 111 of 129 8.7 CONDUCTED RF SPURIOUS EMISSION Left Condition Mode Frequency (MHz) Antenna Max Value (dBc) Limit (dBc) Verdict NVNT 1-DH5 2402 Ant 1 -60.76 -20 Pass NVNT 1-DH5 2441 Ant 1 -59.14 -20 Pass NVNT 1-DH5 2480 Ant 1 -61.02 -20 Pass NVNT 2-DH5 2402 Ant 1 -61.61 -20 Pass NVNT 2-DH5 2441 Ant 1 -60.25 -20 Pass NVNT 2-DH5 2480 Ant 1 -61.44 -20 Pass NVNT 3-DH5 2402 Ant 1 -61.87 -20 Pass NVNT 3-DH5 2441 Ant 1 -56.71 -20 Pass NVNT 3-DH5 2480 Ant 1 -59.72 -20 Pass Tx. Spurious NVNT 1-DH5 2402MHz Ant1 Ref Report No.: STR201120002001E Version.1.2 Page 112 of 129 Tx. Spurious NVNT 1-DH5 24…

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Radiated Measurement Photos (Left) Radiated Measurement Photos (Right) Conducted Measurement Photos