2AML6KR309True wireless earbuds

KINGRAY ELECTRONICS Co., LTD 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Series Models Description Date: 2020/04/06 To: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD FCC ID: 2AML6KR309 Dear Sir/Madam, We, KINGRAY ELECTRONICS Co., LTD. Hereby declares the following statement for Federal Communications Commission, PCB board, circuit, and internal of these model(s) are the same, The color and model number is different for these models: Product name: True wireless earbuds Model no.: BB2811, BB2836, KR309 Additionally, there are two different types of structures and external appearance with the same PCB board. Sincerely, Name: Jason Wang Date: 04.06,2020 Title: Manager Signature of applicant:

CONFIDENTIALITY REQUEST for Certification Service in USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 Date: 2020/04/06 TO WHOM IT MAY CONCERN 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 2AML6KR309 BB2811, BB2836, KR309 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： Jason Wang/ Manager Company: KINGRAY ELECTRONICS Co., LTD Address: 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Phone: 86-755-93772715 Fax: 86-755-93772715 E-Mail: [email protected]

KINGRAY ELECTRONICS Co., LTD 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 04/06/2020 To whom it may concern: We, KINGRAY ELECTRONICS Co., LTD the undersigned, hereby authorize Eurofins Product Service GmbH to act on our behalf in all matters relating to applications for equipment authorization FCC ID: 2AML6KR309 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： Jason Wang/ Manager Company: KINGRAY ELECTRONICS Co., LTD Address: 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Phone: 86-755-93772715 Fax: 86-755-93772715 E-Mail: [email protected]

FCC ID: 2AML6KR309 FCC ID: 2AML6KR309 FCC ID: 2AML6KR309 FCC ID: 2AML6KR309 FCC ID: 2AML6KR309 FCC ID: 2AML6KR309

FCC ID: 2AML6KR309

FCC ID: 2AML6KR309 FCC ID: 2AML6KR309 FCC ID: 2AML6KR309

RF Exposure evaluation FCC ID: 2AML6KR309 1.1. Applicable Standard According to §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 §1.1310 and §2.1093 RF exposure requirement KDB447498 v06: Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies 1.2. Requirement According to KDB447498 D01 General RF Exposure Guidance v06 Section 4.3.1 Standalone SAR test exclusion considerations: “Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition, listed below, is satisfied. These test exclusion conditions are based on source-based time-averaged maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up tolerance, and the minimum test separation distance required for the exposure conditions.22 The minimum test separation distance is determined by the smallest distance from the antenna and radiating structures or outer surface of the device, according to the host form factor, exposure conditions and platform requirements, to any part of the body or extremity of a user or bystander (see 5) of section 4.1). To qualify for SAR test exclusion, the test separation distances applied must be fully explained and justified by the operating configurations and exposure conditions of the transmitter and applicable host platform requirements, typically in the SAR measurement or SAR analysis report, according to the required published RF exposure KDB procedures. When no other RF exposure testing or reporting is required, a statement of justification and compliance must be included in the equipment approval, in lieu of the SAR report, to qualify for the SAR test exclusion. When required, the device specific conditions described in the other published RF exposure KDB procedures must be satisfied before applying these SAR test exclusion provisions; for example, handheld PTT two-way radios, handsets, laptops & tablets etc.23 “ [(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 • 3.0 and 7.5 are referred to as the numeric thresholds in the step 2 below The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 5) in section 4.1 is applied to determine SAR test exclusion. 1.3. Manufacturing tolerance GFSK(Peak) Channel Channel 00 Channel 39 Channel 78 Target (dBm) 1.0 1.0 0.0 Tolerance ±(dB) 1.0 1.0 1.0 π/4DQPSK (Peak) Channel Channel 00 Channel 39 Channel 78 Target (dBm) 1.0 1.0 0.0 Tolerance ±(dB) 1.0 1.0 1.0 Page 2 of 2 2. E v a l u a t i o n R e s u l t Evaluation Results Band/Mode f (GHz) Antenna Distance (mm) RF output power (including tune-up tolerance) SAR Test Exclusion Threshold SAR Test Exclusion dBm mW BT 2.480 5 2.0 1.5849 0.499<3.0 Yes 1.5849 3. C o n c l u s i o n The measurement results comply with the FCC Limit per 47 CFR 2.1093 for the uncontrolled RF Exposure and SAR Exclusion Threshold per KDB 447498 v06 .....................End of Report.........................

Page 1 of 48 Report No.: HK2003230386-E FCC TEST REPORT Test report On Behalf of KINGRAY ELECTRONICS Co., LTD For True wireless earbuds Model No.: BB2811,BB2836,KR309 FCC ID:2AML6KR309 Prepared for : KINGRAY ELECTRONICS Co., LTD 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Prepared By : Shenzhen HUAK Testing Technology Co., Ltd. 1F, B2 Building, Junfeng Zhongcheng Zhizao Innovation Park, Fuhai Street, Bao'an District, Shenzhen City, China Page 2 of 48 Report No.: HK2003230386-E TEST REPORT Applicant’s name ..................: KINGRAY ELECTRONICS Co., LTD Address ..................................: 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Manufacture's Name ............: KINGRAY ELECTRONICS Co., LTD Address ..................................: 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Product description Trade Mark: billboard Product name ............................ : True wireless earbuds Model and/or type reference ..: BB2811,BB2836,KR309 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 HUAK Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HUAK Testing Technology 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 ............ : Mar.10, 2020 ~. Mar.26, 2020 Date of Issue .......................................... : Mar.26, 2020 Test Result ............................................. : Pass Testing Engineer : (Gary Qian) Technical Manager : (Eden Hu) Authorized Signatory : (Jason Zhou) Page 3 of 48 Report No.: HK2003230386-E Contents 1. 0BT E S T S T A N D A R D S................................................................. 4 2. 1BS U M M A R Y ............................................................................ 5 2.1. 7BProduct Description 5 2.2. 8BEquipment Under Test 5 2.3. 9BShort description of the Equipment under Test (EUT) 5 2.4. 10BEUT operation mode 6 2.5. 11BBlock Diagram of Test Setup 7 2.6. 12BRelated Submittal(s) / Grant (s) 7 2.7. Modifications 7 3. 2BT E S T E N V I R O N M E N T ............................................................. 8 3.1. TEST FACILITY 8 3.2. 17BEnvironmental conditions 8 3.3. 18BSummary of measurement results 8 3.4. 19BStatement of the measurement uncertainty 9 3.5. 20BEquipments Used during the Test 9 4. 3BT E S T C O N D I T I O N S A N D R E S U L T S .......................................... 11 4.1. 21BAC Power Conducted Emission ................................................................................... 11 4.2. Radiated Emission ........................................................................................................ 14 4.3. 23BMaximum Peak Output Power ...................................................................................... 21 4.4. 24B20dB Bandwidth ........................................................................................................... 22 4.5. 25BFrequency Separation .................................................................................................. 25 4.6. 26BBand Edge Compliance of RF Emission ...................................................................... 27 4.7. 27BSpurious RF Conducted Emission ............................................................................... 31 4.8. 28BNumber of hopping frequency ...................................................................................... 35 4.9. 29BTime Of Occupancy(Dwell Time) ................................................................................. 37 4.10. 30BPseudorandom Frequency Hopping Sequence ........................................................... 40 4.11. 31BAntenna Requirement ................................................................................................... 41 5. 4BT E S T S E T U P P H O T O S O F T H E E U T ........................................ 42 6. P H O T O S O F T H E E U T ........................................................... 43 Page 4 of 48 Report No.: HK2003230386-E 1. 0BT E S T S T A N D A R D S The tests were performed according to following standards: FCC Rules Part 15.247: Frequency Hopping, Direct Spread Spectrum and Hybrid Systems that are in operation within the bands of 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz. ANSI C63.10-2013: American National Standard for Testing Unlicensed Wireless Devices DA 00-705: Filing and Measurement Guidelines for Frequency Hopping Spread Spectrum Systems Page 5 of 48 Report No.: HK2003230386-E 2. 1BS U M M A R Y 2.1. 7BProduct Description Name of EUT True wireless earbuds Trade Mark: billboard Model Number BB2811 List Model: BB2836,KR309 Power Rating DC 3.7V and DC 5V From Charging case Adapter(Auxiliary test Provided by the laborator) Mode:EP-TA20CBC Input:AC100-240V-50/60Hz，0.5A Output:DC 5V,2A FCC ID 2AML6KR309 Bluetooth FCC Operation frequency 2402MHz-2480MHz Bluetooth Modulation GFSK,π/4DQPSK Antenna Type PCB antenna Antenna gain 0.00dBi 2.2. 8BEquipment Under Test Power supply system utilised Power supply voltage : ○ 230V / 50 Hz ○ 120V / 60Hz ○ 12 V DC ○ 24 V DC ● Other (specified in blank below) DC 3.7V and DC 5V From Charging case 2.3. 9BShort description of the Equipment under Test (EUT) This is a True wireless earbuds. For more details, refer to the user’s manual of the EUT. Page 6 of 48 Report No.: HK2003230386-E 2.4. 10BEUT operation mode The Applicant provides test softwa…

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FCC ID: 2AML6KR309 FCC ID: 2AML6KR309