2AML6BB106BWireless Bluetooth Headphones

KINGRAY ELECTRONICS Co., LTD 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Tel: + 86-755-93772715 Fax: + 86-755-93772715 Series Models Description Date: 2021/04/16 To: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD FCC ID: 2AML6BB106B Dear Sir/Madam, We, KINGRAY ELECTRONICS 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 color and model number is different for these model: Product name: Wireless Bluetooth Headphones Model no.: BB106B, BB427, KRBT-861, KRBT-830, BIG-9934, EV7730, EV7731, EV7732 Sincerely, Name: Jason wang 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]

CONFIDENTIALITY REQUEST for Certification Service in USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 Date: Apr. 16, 2021 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 2AML6BB106B BB106B, BB427, KRBT-861, KRBT-830, BIG-9934, EV7730, EV7731, EV7732 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: Jason wang 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 Tel: + 86-755-93772715 Fax: + 86-755-93772715 Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 4/20/2021 To whom it may concern: We, the undersigned, hereby authorize Eurofins Product Service GmbH to act on our behalf in all matters relating to applications for equipment authorization FCC ID: 2AML6BB106B 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: Jason wang 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: 2AML6BB106B

FCC ID: 2AML6BB106B

FCC ID: 2AML6BB106B BT antenna

RF Exposure evaluation FCC ID: 2AML6BB106B 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 Channel Channel 00 Channel 39 Channel 78 Target (dBm) -2.0 -1.0 0.0 Tolerance ±(dB) 1.0 1.0 1.0 π/4DQPSK Channel Channel 00 Channel 39 Channel 78 Target (dBm) -1.0 0.0 1.0 Tolerance ±(dB) 1.0 1.0 1.0 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 1.585 0.5<3.0 Yes 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, No SAR is required. .....................End.........................

Shenzhen Global Test Service Co.,Ltd. No.7-101 and 8A-104, Building 7 and 8, DCC Cultural and Creative Garden, No.98, Pingxin North Road, Shangmugu Community, Pinghu Street, Longgang District, Shenzhen, Guangdong FCC PART 15 SUBPART CTEST REPORT FCC PART 15.247 Report Reference No. .....................: FCC ID. ............................................: GTS20210408012-1-1 2AML6BB106B Compiled by ( position+printedname+signature) ...: File administrators Jimmy Wang Supervised by (position+printedname+signature) ....: Test Engineer Aaron Tan Approved by (position+printedname+signature) ....: Manager Jason Hu Date of issue .....................................: Apr. 08, 2021 Representative Laboratory Name .: Shenzhen Global Test Service Co.,Ltd. Address ............................................: No.7-101 and 8A-104, Building 7 and 8, DCC Cultural and Creative Garden, No.98, Pingxin North Road, Shangmugu Community, Pinghu Street, Longgang District, Shenzhen, Guangdong 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 Test specification ...........................: Standard ...........................................: FCC Part 15.247 TRF Originator ..................................: Shenzhen Global Test Service Co.,Ltd. Master TRF .......................................: Dated 2014-12 Shenzhen Global Test Service Co.,Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen Global Test Service Co.,Ltd. is acknowledged as copyright owner and source of the material. Shenzhen Global Test Service 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. Test item description .....................: Wireless Bluetooth Headphones Trade Mark .......................................: N/A Manufacturer ....................................: KINGRAY ELECTRONICS Co., LTD Model/Type reference .......................: BB427 Listed Models ..................................: BB106B, KRBT-861, KRBT-830, BIG-9934, EV7730, EV7731, EV7732 Modulation Type ...............................: GFSK,Π/4DQPSK Operation Frequency ........................: From 2402MHz to 2480MHz Rating ...............................................: DC3.7V from battery Result ...............................................: PASS Report No.: GTS20210408012-1-1 Page 2 of 43 T E S T R E P O R T Test Report No. : GTS20210408012-1-1 Apr. 08, 2021 ____________________________________________________________________________________ Date of issue Equipment under Test : Wireless Bluetooth Headphones Model /Type : BB427 Listed Models : BB106B, KRBT-861, KRBT-830, BIG-9934, EV7730, EV7731, EV7732 Applicant : KINGRAY ELECTRONICS Co., LTD Address : 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Manufacturer : KINGRAY ELECTRONICS Co., LTD Address : 3F, Building 13th, Xingwei the third Industrial Park, Fenghuang Village, Fuyong town, Baoan District, Shenzhen, Guangdong, China Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: GTS20210408012-1-1 Page 3 of 43 Contents 1 T E S T S T A N D A R D S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2 S U M M A R Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 2.1 General Remarks 5 2.2 Product Description 5 2.3 Test Sample 5 2.4 Equipment Under Test 5 2.5 Short description of the Equipment under Test (EUT) 6 2.6 EUT operation mode 6 2.7 Block Diagram of Test Setup 6 2.8 Related Submittal(s) / Grant (s) 6 2.9 Modifications 6 3 T E S T E N V I R O N M E N T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 3.1 Address of the test laboratory 7 3.2 Test Facility 7 3.3 Environmental conditions 7 3.4 Summary of measurement results 8 3.5 Statement of the measurement uncertainty 8 3.6 Equipments Used during the Test 9 4 T E S T C O N D I T I O N S A N D R E S U L T S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 0 4.1 AC Power Conducted Emission 10 4.2 Radiated Emission 13 4.3 MaximumPeak Output Power 20 4.4 20dB Bandwidth 21 4.5 Frequency Separation 24 4.6 Number of hopping frequency 26 4.7 Time of Occupancy (Dwell Time) 28 4.8 Out-of-band Emissions 31 4.9 Pseudorandom Frequency Hopping Sequence 37 4.10 Antenna Requirement 38 5 T E S T S E T U P P H O T O S O F T H E E U T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 9 6 P H O T O S O F T H E E U T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 0 Report No.: GTS20210408012-1-1 Page 4 of 43 1 T 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:AmericanNationalStandardforTestingUnlicensedWirelessDevices Report No.: GTS20210408012-1-1 Page 5 of 43 2 S U M M A R Y 2.1 General Remarks Date of receipt of test sample : Mar. 25, 2021 Testing commenced on : Mar. 26, 2021 Testing concluded on : Apr. 06, 2021 2.2 Product Description Product Name: Wireless Bluetooth Headphones Model/Type reference: BB427 Powe…

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Report No.: GTS20210408012-1-1 Page 24 of 43 4.5 Frequency Separation LIMIT According to 15.247(a)(1),frequency hopping systems shall have hopping channel carrier frequencies separated by minimum of 25KHz or the 2/3*20dB bandwidth of the hopping channel, whichever is greater. TEST PROCEDURE The transmitter output was connected to the spectrum analyzer through an attenuator. The bandwidth of the fundamental frequency was measured by spectrum analyzer with100 KHz RBW and 300 KHz VBW. TEST CONFIGURATION EUT SPECTRUM ANALYZER TEST RESULTS Temperature 22.8°C Humidity 56% Test Engineer Moon Tan Configurations BT Modulation Channel Channel Separation (MHz) Limit(MHz) Result CH39 GFSK CH40 1.000 25KHz or 2/3*20dB bandwidth Pass CH39 π/4DQPSK CH40 1.000 25KHz or 2/3*20dB bandwidth Pass Note: We have tested all mode at high, middle and low channel, andrecorded worst case at middle Test plot as follows: Report No.: GTS20210408012-1-1 Page 25 of 43 GFSK Modulation π/4DQPSKModulation Report No.: GTS20210408012-1-1 Page 26 of 43 4.6 Number of hopping frequency Limit Frequency hopping systems in the 2400–2483.5 MHz band shall use at least 15 channels. Test Procedure The transmitter output was connected to the spectrum analyzer through an attenuator. Set spectrum analyzer start 2400MHz to 2483.5MHz with 100 KHz RBW and 300 KHz VBW. Test Configuration EUT SPECTRUM ANALYZER Test Results Temperature 22.8°C Humidity 56% Test Engineer Moon Tan Configurations BT Modulation Number of Hopping Channel Limit Result GFSK 79 π/4DQPSK 79 ≥15 Pass Test plot as follows: Report No.: GTS20210408012-1-1 Page 27 of 43 GFSK Modulation π/4DQPSK Modulation Report No.: GTS20210408012-1-1 Page 28 of 43 4.7 Time of Occupancy (Dwell Time) Limit The average time of occupancy on any channel shall not be greater than 0.4 seconds within a period of 0.4 seconds multiplied by the number of hopping channels employed. Test Procedure The transmitter output was connected to the spectrum analyzer through an attenuator. Set center frequency of spectrum analyzer=operating frequency with 1MHz RBW and 1MHz VBW, Span 0Hz. Test Configuration EUT SPECTRUM ANALYZER Test Results Temperature 22.8°C Humidity 56% Test Engineer Moon Tan Configurations BT Modulation Packet Pulse time (ms) Dwell time (s) Limit (s) Result DH1 0.37 0.118 DH3 1.65 0.264 GFSK DH5 2.85 0.304 0.40 Pass 2-DH1 0.38 0.122 2-DH3 1.631 0.261 π/4DQPSK 2-DH5 2.875 0.307 0.40 Pass Note: 1. We have tested all mode at high,middle and low channel,and recoreded worst case at middle channel. 2. Dwell time=Pulse time (ms) × (1600 ÷ 2 ÷ 79) ×31.6 Second for DH1, 2-DH1; Dwell time=Pulse time (ms) × (1600 ÷ 4 ÷ 79) ×31.6 Second for DH3, 2-DH3; Dwell time=Pulse time (ms) × (1600 ÷ 6 ÷ 79) ×31.6 Second for DH5, 2-DH5. Test plot as follows: Report No.: GTS20210408012-1-1 Page 29 of 43 GFSK Modulation DH1 DH3 DH5 Report No.: GTS20210408012-1-1 Page 30 of 43 π/4DQPSK Modulation 2-DH1 2-DH3 2-DH5 Report No.: GTS20210408012-1-1 Page 31 of 43 4.8 Out-of-band Emissions Limit In any 100 kHz bandwidth outside the frequency band in which the spread spectrum or digitally modulated intentional radiator is operating, the radio frequency power that is produced by the intentional radiator shall be at least 20 dB below that in the 100 kHz bandwidth within the band that contains the highest level of the desiredpower, based on either an RF con-ducted or a radiated measurement, pro-vided the transmitter demonstrates compliance with the peak conducted power limits. If the transmitter com-plies with the conducted power limits based on the use of RMS averaging over a time interval, as permitted under paragraph (b)(3) of this section, the attenuation required under this paragraph shall be 30 dB instead of 20 dB.Attenuation below the general limits specified in §15.209(a) is not required. Test Procedure Connect the transmitter output to spectrumanalyzer using a low loss RF cable, and set the spectrumanalyzer to RBW=100 kHz, VBW= 300 kHz, peak detector , and max hold. Measurements utilizing these setting are made of the in-band reference level, bandedge and out-of-band emissions. Test Configuration EUT SPECTRUM ANALYZER Test Results Temperature 22.8°C Humidity 56% Test Engineer Moon Tan Configurations BT Remark: The measurement frequency range is from 30MHz to the 10th harmonic of the fundamental frequency. The lowest, middle and highest channels are tested to verify the spurious emissions and bandage measurement data. We measured all conditions (DH1, DH3, DH5) and recorded worst case at DH5 Test plot as follows: Report No.: GTS20210408012-1-1 Page 32 of 43 GFSK CH00 GFSK CH39 30MHz-3GHz 30MHz-3GHz 3GHz-25GHz 3GHz-25GHz Report No.: GTS20210408012-1-1 Page 33 of 43 GFSK CH78 π/4DQPSK CH00 30MHz-3GHz 30MHz-3GHz 3GHz-25GHz 3GHz-25GHz Report No.: GTS20210408012-1-1 Page 34 of 43 π/4DQPSK CH39 π/4DQPSK CH78 30MHz-3GHz 30MHz-3GHz 3GHz-25GHz 3GHz-25GHz Report No.: GTS20210408012-1-1 Page 35 of 43 Band-edge Measurements for RF Conducted Emissions: GFSK Left Band edge hoping off Right Band edge hoping off Left Band edge hoping on Right Band edge hoping on π/4DQPSK Left Band edge hoping off Right Band edge hoping off Report No.: GTS20210408012-1-1 Page 36 of 43 Left Band edge hoping on Right Band edge hoping on Report No.: GTS20210408012-1-1 Page 37 of 43 4.9 Pseudorandom Frequency Hopping Sequence TEST APPLICABLE For 47 CFR Part 15C section 15.247 (a) (1) requirement: Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hop-ping channel, whichever is greater. Alternatively, frequency hopping systems operating in the 2400–2483.5 MHz band may have hopping channel carrier frequencies that are separated by 25 kHz or two-thirds of the 20 dB bandwidth of the hopping channel, whichever is greater, provided the systems operate with an output power no greater than 125 mW. The system shall hop to channel frequencies that are selected at the system hopping r…

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FCC ID: 2AML6BB106B