2AML6KR240Wireless earbuds

FCC ID: 2AML6KR240

FCC ID: 2AML6KR240

FCC ID: 2AML6KR240 Antenna

RF Exposure evaluation FCC ID: 2AML6KR240 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) 5.0 5.0 5.0 Tolerance ±(dB) 1.0 1.0 1.0 π/4DQPSK Channel Channel 00 Channel 39 Channel 78 Target (dBm) 6.0 6.0 6.0 Tolerance ±(dB) 1.0 1.0 1.0 8DPSK Channel Channel 00 Channel 39 Channel 78 Target (dBm) 6.0 6.0 6.0 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 7 5.012 1.6<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.........................

Productspecification QuickReferenceDate Allthetechnicaldataandinformationcontainedhereinaresubjecttochangewithoutpriornotice AntennaLayout&moduleonthe systemboard AntennaGain GainTable Antennamoduleonthesystemboard Frequency2.45GHz*1 Ant.PortInputPwr.(dBm)0(Typ.BTclass2outputpower) Tot.Rad.Pwr.(dBm)-2.3(Inputpwr–losspwr) PeakEIRP(dBm)1.3 Directivity(dBi)1(alldirectionantenna) Efficiency(dB)-2.3(58.5%) Gain(dBi)1.3(PeakGainXY-plane) MaximumPower(dBm)1.3(XY-plane) MinimumPower(dBm)-4(XY-plane) Avg.Power(dBm)-0.5(XY-plane) Max/MinRatio(dB)5.3(XY-plane) Max/AvgRatio(dB)1.8(XY-plane) Min/AvgRatio(dB)-3.5(XY-plane) AverageGain(dB)-0.5(AvgGainXY-plane) UnitindBi @2.44GHz XY-planeXZ-planeYZ-plane Efficiency PeakAvg.PeakAvg.PeakAvg. ModuleBoard 1.3-0.51.2-3.81.1-3.0 58.5% ReturnLoss TheEnvironmentofAntennaRadiationPattern 3Dradiationpatterndiagram XY-planeXZ-planeYZ-plane

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. .............................................: GTS20220908007-1-1 2AML6KR240 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 ..................................... : Sep. 22, 2022 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 earbuds Trade Mark ....................................... : N/A Manufacturer .................................... : KINGRAY ELECTRONICS Co., LTD Model/Type reference....................... : BB2400 Listed Models .................................. : N/A Modulation Type ............................... : GFSK, Π/4DQPSK, 8DPSK Operation Frequency ........................ : From 2402MHz to 2480MHz Rating ............................................... : DC3.7V from battery Result................................................ : PASS Report No.: GTS20220908007-1-1 Page 2 of 47 T E S T R E P O R T Test Report No. : GTS20211010005-1-1 Sep. 22, 2022 ____________________________________________________________________________________ Date of issue Equipment under Test : Wireless earbuds Model /Type : BB2400 Listed Models : N/A 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.: GTS20220908007-1-1 Page 3 of 47 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 ........................................... 10 4.1 AC Power Conducted Emission 10 4.2 Radiated Emission 13 4.3 Maximum Peak Output Power 20 4.4 20dB Bandwidth 21 4.5 Frequency Separation 25 4.6 Number of hopping frequency 27 4.7 Time ofOccupancy (Dwell Time) 29 4.8 Out-of-band Emissions 33 4.9 Pseudorandom Frequency Hopping Sequence 41 4.10 Antenna Requirement 42 5 P H O T O S O F T H E E U T ........................................................... 43 Report No.: GTS20220908007-1-1 Page 4 of 47 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.: GTS20220908007-1-1 Page 5 of 47 2 S U M M A R Y 2.1 General Remarks Date of receipt of test sample : Sep. 12, 2022 Testing commenced on : Sep. 12, 2022 Testing concluded on : Sep. 22, 2022 2.2 Product Description Product Name: Wireless earbuds Model/Type reference: BB2400 Power supply: DC 3.7V from battery Hardware version: MC-BT1108-V1 Software version: V1.0 Sample ID: GTS20220908007-1-S0001-1#/ GTS20220908007-1-S0001-2# Adapter(Auxiliary testProvided by the laborator) Mode:EP-TA20CBC Input:AC100-240V-50/60Hz，0.5A Output:DC 5V,2A Bluetooth : Supported Type: Bluetooth BR/EDR Modulation: GFSK, π/4DQPSK, 8DPSK Operation frequency: 2402MHz~2480MHz Channel number: 79 Channel separation: 1MHz Antenna type: PCB antenna Antenna gain: 1.3dBi 2.3 Test Sample The application provides 2 samples to meet requirement. Sample Number Description G…

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Report No.: GTS20220908007-1-1 Page 35 of 47 GFSK CH78 π/4DQPSK CH00 Reference Reference 30MHz-3GHz 30MHz-3GHz 3GHz-25GHz 3GHz-25GHz Report No.: GTS20220908007-1-1 Page 36 of 47 π/4DQPSK CH39 π/4DQPSK CH78 Reference Reference 30MHz-3GHz 30MHz-3GHz 3GHz-25GHz 3GHz-25GHz Report No.: GTS20220908007-1-1 Page 37 of 47 8DPSK CH00 8DPSK CH39 Reference Reference 30MHz-3GHz 30MHz-3GHz 3GHz-25GHz 3GHz-25GHz Report No.: GTS20220908007-1-1 Page 38 of 47 8DPSK CH78 Reference 30MHz-3GHz 3GHz-25GHz Report No.: GTS20220908007-1-1 Page 39 of 47 Band-edge Measurements for RF Conducted Emissions: GFSK Left Band edge hoping off RightBand edge hoping off Left Band edge hoping on RightBand edge hoping on π/4DQPSK Left Band edge hoping off RightBand edge hoping off Report No.: GTS20220908007-1-1 Page 40 of 47 Left Band edge hoping on RightBand edge hoping on 8DPSK Left Band edge hoping off RightBand edge hoping off Left Band edge hoping on RightBand edge hoping on Report No.: GTS20220908007-1-1 Page 41 of 47 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 rate from a pseudo randomly ordered list of hopping frequencies. Each frequency must be used equally on the average by each transmitter. The system receivers shall have input bandwidths that match the hop-ping channel bandwidths of their corresponding transmitters and shall shift frequencies in synchronization with the transmitted signals. EUT Pseudorandom Frequency Hopping Sequence Requirement The pseudorandom frequency hopping sequence may be generated in a nice-stage shift register whose 5 th and 9 th stage outputs are added in a modulo-two addition stage. And the result is fed back to the input of the firststage. The sequence begins with the first one of 9 consecutive ones, forexample: the shift register is initialized with nine ones. ● Number of shift register stages:9 ● Length of pseudo-random sequence:29-1=511 bits ● Longest sequence of zeros:8(non-inverted signal) An example of pseudorandom frequency hopping sequence as follows: Each frequency used equally one the average by each transmitter. The system receiver have input bandwidths that match the hopping channel bandwidths of their corresponding transmitter and shift frequencies in synchronization with the transmitted signals. Report No.: GTS20220908007-1-1 Page 42 of 47 4.10 Antenna Requirement Standard Applicable For intentional device, according to FCC 47 CFR Section 15.203, an intentional radiator shall be designed to ensure that no antenna other than that furnished by the responsible party shall be used with the device. And according to FCC 47 CFR Section 15.247 (c), if transmitting antennas of directional gain greater than 6dBi are used, the power shall be reduced by the amount in dB that the directional gain of the antenna exceeds 6dBi. Refer to statement below for compliance The manufacturer may design the unit so that the user can replace a broken antenna, but the use of a standard antenna jack or electrical connector is prohibited. Further, this requirement does not apply to intentional radiators that must be professionally installed. Antenna Connected Construction The maximum gain of antenna was 1.3dBi. Report No.: GTS20220908007-1-1 Page 43 of 47 5 T e s t S e t u p Ph o t o s o f t h e E U T Report No.: GTS20220908007-1-1 Page 44 of 47 6 P h o t o s o f t h e E U T External Photos of EUT Report No.: GTS20220908007-1-1 Page 45 of 47 Report No.: GTS20220908007-1-1 Page 46 of 47 Report No.: GTS20220908007-1-1 Page 47 of 47 Internal Photos of EUT ********************** End of Report ********************** Antenna

FCC ID: 2AML6KR240