2AML6KR315AWireless Earbuds

2AML6KR315A

KINGRAY ELECTRONICS Co., LTD (December 17, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for FCC ID: 2AML6KR315A [KINGRAY ELECTRONICS Co., LTD] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Sincerely, (Applicant signature) (Applicant printed name) Jason Wang KINGRAY ELECTRONICS Co., LTD (December 17, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for FCC ID: 2AML6KR315A [KINGRAY ELECTRONICS Co., LTD] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) Jason Wang

KINGRAY ELECTRONICS Co., LTD (December 17, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Wireless Earbuds / BB2401, BB2408, BSTWS46, BSTWS39, KRTW05 / FCC ID: 2AML6KR315A) 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 Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☒ Internal Photos ☐ NOTE 1 ☒ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No 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. Please contact me if there is any information you may need. Sincerely, Signature: Name: Jason Wang Title: Manager

KINGRAY ELECTRONICS Co., LTD (December 17, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology 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, Signature: Name: Jason Wang Title: Manager

KINGRAY ELECTRONICS Co., LTD Model Difference Data：December 17, 2024 Product description: Wireless Earbuds Model name: BB2401, BB2408, BSTWS46, BSTWS39, KRTW05 Trade Name: N/A FCC ID: 2AML6KR315A All the model are the same circuit and RF module, only the name is different. Regards Sincerely Client’s signature : Client’s name / title : Jason Wang（Manager） Contact information / address： 3rd floor, Building A5, Mingxi Industrial Park, No 4, Huaide South Road, Fuyon g Town, Baoan District, Shenzhen City, China

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 7 Model: BB2401 External Photos L Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 7 R Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 5 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 6 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 7 of 7

FCC ID LABEL: Label Location: FCC ID: 2AML6KR315A Model No.: BB2401

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 6 Model: BB2401 Internal Photos L Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 6 ANT Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 6 R Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 6 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 5 of 6 ANT Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 6 of 6

Shenzhen CTB Testing Co., Ltd. FCC ID:2AML6KR315A 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. EDR: 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 1.997 1.58 1±1 2.00 1.58 <5 0.49127 3.00 YES 2.441 2.155 1.64 2±1 3.00 2.00 <5 0.62347 3.00 YES 2.480 1.89 1.55 1±1 2.00 1.58 <5 0.49918 3.00 YES 2.402 2.635 1.83 2±1 3.00 2.00 <5 0.61847 3.00 YES 2.441 2.746 1.88 2±1 3.00 2.00 <5 0.62347 3.00 YES 2.480 2.399 1.74 2±1 3.00 2.00 <5 0.62843 3.00 YES 2.402 2.882 1.94 2±1 3.00 2.00 <5 0.61847 3.00 YES 2.441 2.978 1.99 2±1 3.00 2.00 <5 0.62347 3.00 YES 2.480 2.673 1.85 2±1 3.00 2.00 <5 0.62843 3.00 YES GFSK π /4DQPSK 8DQPSK Conclusion: For the max result : 0.62843≤ FCC Limit 3.0 for 1g SAR.

3216 Antenna Specification Summary ITEMANT SPEC Model Name 2.4G ANT Center Frequency HorizontalVertical 2400MHz2450MHz2500MHz2400MHz2450MHz2500MHz -6.61 -6.15-5.85 -6.04 -5.09-5.05 MAX. Gain -1.62dBi PolarizationHorizontal and Vertical Azimuth Beam Pattern Omni-directional Impedance 50 Ohm Antenna SIZE 3.8*1.9 Manufacture ZHUHAI JIELI TECHNOLOGY CO.,LTD Antenna Photo & Length (mm） Freq(MHz)Gain(dBi)Efficiency(dB)Efficiency(%) 2400-2.11369641656507-9.2788265258229611.8063960422871 2410-2.02055655985847-9.1591014654237212.1363992080454 2420-1.91573616729846-9.0240240498353912.5198058753877 2430-1.85859497400232-8.8888847529028812.9155089501759 2440-1.73740482325815-8.7457932324862613.3481376552415 2450-1.70982239505769-8.672653551601613.5748376671312 2460-1.69868874488961-8.6102643029809213.7712565721611 2470-1.65732079351841-8.5145277919765614.078202922223 2480-1.62505903502237-8.4140979118407914.4075524344587 2490-1.64238652861171-8.3369478927768614.6657815137026 2500-1.66617202727468-8.254517792771114.9467999093707 2450 XY-Plane 2450 ZY-Plane 2450 ZX-Plane GainPlaneEfficiency-Plane 测试机构：咏业科技（深圳）有限公司 联系人：程先生13128982278

Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 56 TEST REPORT Compiled by: Reviewed by: Approved by: Zhou Kui Arron Liu Bin Mei / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: Wireless Earbuds FCC ID: 2AML6KR315A Trademark: N/A Model Number: BB2401, BB2408, BSTWS46, BSTWS39, KRTW05 Prepared For: KINGRAY ELECTRONICS Co., LTD Address: 3rd floor, Building A5, Mingxi Industrial Park, No 4, Huaide South Road, Fuyong Town, Baoan District, Shenzhen City, China Manufacturer: KINGRAY ELECTRONICS Co., LTD Address: 3rd floor, Building A5, Mingxi Industrial Park, No 4, Huaide South Road, Fuyong Town, Baoan District, Shenzhen City, China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Nov. 28, 2024 Sample tested Date: Nov. 28, 2024 to Dec. 06, 2024 Issue Date: Dec. 06, 2024 Report No.: CTB24112802202RF01 Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2013 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.:CTB24112802202RF01 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 56 TABLE OF CONTENT Test Report Declaration Page 1. VERSION .......................................................................... 4 2. TEST SUMMARY ................................................................... 5 3. MEASUREMENT UNCERTAINTY ..................................................... 6 4. PRODUCT INFORMATION AND TEST SETUP ......................................... 7 4.1 Product Information ................................................................... 7 4.2 Test Setup Configuration ............................................................... 7 4.3 Support Equipment.................................................................... 7 4.4 Channel List ......................................................................... 8 4.5 Test Mode ........................................................................... 8 4.6 Test Environment ..................................................................... 8 5. TEST FACILITY AND TEST INSTRUMENT USED ....................................... 9 5.1 Test Facility .......................................................................... 9 5.2 Test Instrument Used .................................................................. 9 6. AC POWER LINE CONDUCTED EMISSION ............................................ 12 6.1 Block Diagram Of Test Setup .......................................................... 12 6.2 Limit ............................................................................... 12 6.3 Test procedure ...................................................................... 12 6.4 Test Result ......................................................................... 14 7. RADIATED SPURIOUS EMISSION ................................................... 16 7.1 Block Diagram Of Test Setup .......................................................... 16 7.2 Limit ............................................................................... 16 7.3 Test procedure ...................................................................... 17 7.4 Test Result ......................................................................... 18 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS .......................... 27 8.1 Block Diagram Of Test Setup .......................................................... 27 8.2 Limit ............................................................................... 27 8.3 Test procedure ...................................................................... 27 8.4 Test Result ......................................................................... 28 9. COUDUCTED PEAK OUTPUT POWER ............................................... 35 9.1 Block Diagram Of Test Setup .......................................................... 35 9.2 Limit ............................................................................... 35 9.3 Test procedure ...................................................................... 35 9.4 Test Result ......................................................................... 35 10. 20DB OCCUPIED BANDWIDTH ..................................................... 39 10.1 Block Diagram Of Test Setup ......................................................... 39 10.2 Limit .............................................................................. 39 10.3 Test procedure ..................................................................... 39 10.4 Test Result ........................................................................ 39 11. CARRIERFREQUENCIES SEPARATION ............................................. 43 11.1 Block Diagram Of Test Setup ......................................................... 43 11.2 Limit .............................................................................. 43 11.3 Test procedure ..................................................................... 43 11.4 Test Result ........................................................................ 43 12. HOPPING CHANNEL NUMBER ..................................................... 47 12.1 Block Diagram Of Test Setup .........................................................…

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Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 2 Model: BB2401 Radiated Emission Below 1G Above 1G Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 2 Conducted emissions