2ALN9-TW93BLUETOOTH EARBUDS

(TRANSTYLE TECHNOLOGY CO., LIMITED) Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: 2ALN9-TW93 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Block Diagram, Schematics, Operational Description Block Diagram Schematics Operational Description The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, ( Scott Zhang) Rev 11/20/07

TRANSTYLE TECHNOLOGY CO., LIMITED Model Difference 2020-09-04 EUT NAME: BLUETOOTH EARBUDS FCC ID: 2ALN9-TW93 MODEL : TW93, TW76 All the model are the same circuit and RF module, only for model name and color. Regards Sincerely Client’s signature Client’s name / title : Scott Zhang / Manager Contact information / address: 1# Building, Dabuxiang Industrial Area, Guanlan Town, Longhua New district, Shenzhen, China. 518110

(TRANSTYLE TECHNOLOGY CO., LIMITED) Federal Communications Commission Authorization and Evaluation Division 1435 Oakland Mills Road Columbia, MD 21046 Date: 2020/09/04 SUBJECT: FCC Application for FCC ID: 2ALN9-TW93 To Whom It May Concern: We, the undersigned, hereby authorize Alan Mei at Shenzhen BCTC Testing Co., Ltd. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by Alan Mei of Shenzhen BCTC Testing Co., Ltd. on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards, ( Scott Zhang)

External Photos

Label & label location FCC ID: 2ALN9-TW93 Label location Label location

RF EXPOSURE EVALUATION METHOD FCC ID: 2ALN9-TW93 SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following Table. The 1-g 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 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 is applied to determine SAR test exclusion. BT-EDR max possible output power (PK,conducted)：3±1dbm 1.15dBi logarithmic terms convert to numeric result is nearly 1.303 4dbm=2.51mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=2.51/5*√2.402 =0. 78≤3.0 Modulation Frequency (MHz) Output Power (dBm) Max Antenna Gain (dBi) GFSK 2402 -0.17 1.15 GFSK 2441 0.35 1.15 GFSK 2480 0.28 1.15 Pi/4 DQPSK 2402 1.61 1.15 Pi/4 DQPSK 2441 2.11 1.15 Pi/4 DQPSK 2480 2.30 1.15 8DPSK 2402 2.15 1.15 8DPSK 2441 2.79 1.15 8DPSK 2480 2.96 1.15 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. 2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 2.51/5*√2.441 =0. 78≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=2.51/5*√2.48=0. 79≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. Conclusion: No SAR is required.

Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2008000359E FCC Part 15C Test Report FCC ID:2ALN9-TW93 Product Name: BLUETOOTH EARBUDS Trademark: N/A Model Name : TW93 TW76 Prepared For : TRANSTYLE TECHNOLOGY CO., LIMITED Address : 1# Building, Dabuxiang Industrial Area, Guanlan Town, Longhua New district, Shenzhen, China. 518110 Prepared By : Shenzhen BCTC Testing Co., Ltd. Address : BCTC Building & 1-2F, East of B Building, Pengzhou Industrial, Fuyuan 1st Road, Qiaotou Community, Fuyong Street, Bao’an District, Shenzhen, China Test Date: Aug. 18, 2020 – Aug. 25, 2020 Date of Report : Aug. 25, 2020 Report No.: BCTC2008000359E Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-0 07 Ver.：A.0 Page 1 of 70 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2008000359E TEST RESULT CERTIFICATION Applicant’s name ............. : TRANSTYLE TECHNOLOGY CO., LIMITED Address .............................. : 1# Building, Dabuxiang Industrial Area, Guanlan Town, Longhua New district, Shenzhen, China. 518110 Manufacture's Name ........ : TRANSTYLE TECHNOLOGY CO., LIMITED Address .............................. : 1# Building, Dabuxiang Industrial Area, Guanlan Town, Longhua New district, Shenzhen, China. 518110 Product description Product name..................... : BLUETOOTH EARBUDS Trademark ......................... : N/A Model and/or type reference TW93 TW76 Standards ......................... : FCC Part15.247 ANSI C63.10:2013 558074 D01 15.247 Meas Guidance v05r02 This device described above has been tested by BCTC, and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of BCTC, this document may be altered or revised by BCTC, personal only, and shall be noted in the revision of the document. Prepared by(Engineer): Willem Wang Reviewer(Supervisor): Eric Yang Approved(Manager): Zero Zhou Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-0 07 Ver.：A.0 Page 2 of 70 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2008000359E Table of Contents Test Report Declaration Page 1. TEST SUMMARY ...................................................... 5 2. TEST FACILITY ....................................................... 6 3. MEASUREMENT UNCERTAINTY........................................ 6 4. GENERAL INFORMATION .............................................. 7 4.1 GENERAL DESCRIPTION OF EUT ....................................... 7 4.2 Test Setup Configuration ................................................ 8 4.3 Support Equipment ..................................................... 8 4.4 Channel List ........................................................... 9 4.5 Test Mode ............................................................ 10 5. TEST FACILITY AND TEST INSTRUMENT USED ........................ 11 5.1 Test Facility ........................................................... 11 5.2 Test Instrument Used .................................................. 11 6. CONDUCTED EMISSIONS ............................................. 13 6.1 Block Diagram Of Test Setup ........................................... 13 6.2 Limit ................................................................. 13 6.3 Test procedure ........................................................ 13 6.4 Test Result ........................................................... 15 7. RADIATED EMISSIONS ............................................... 17 7.1 Block Diagram Of Test Setup ........................................... 17 7.2 Limit ................................................................. 18 7.3 Test procedure ........................................................ 18 7.4 Test Result ........................................................... 20 7.5 RADIATED BAND EMISSION MEASUREMENT AND RESTRICTED BANDS OF OPERATION ........................................................... 24 8. CONDUCTED EMISSION .............................................. 27 8.1 Block Diagram Of Test Setup ........................................... 27 8.2 Limit ................................................................. 27 8.3 Test procedure ........................................................ 27 8.4 Test Result ........................................................... 28 9. 20 DB BANDWIDTH .................................................. 37 9.1 Block Diagram Of Test Setup ........................................... 37 9.2 Limit ................................................................. 37 9.3 Test procedure ........................................................ 37 9.4 Test Result ........................................................... 38 10. MAXIMUM PEAK OUTPUT POWER .................................... 44 10.1 Block Diagram Of Test Setup .......................................... 44 10.2 Limit ................................................................ 44 10.3 Test procedure ....................................................... 44 10.4 Test Result .......................................................... 45 11. HOPPING CHANNEL SEPARATION .................................... 50 11.1 Block Diagram Of Test Setup .......................................... 50 Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-0 07 Ver.：A.0 Page 3 of 70 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2008000359E 11.2 Limit ................................................................ 50 11.3 Test procedure ....................................................... 50 11.4 Test Result .......................................................... 51 12. NUMBER OF HOPPING FREQUENCY .................................. 56 12.1 Block Diagram Of Test Setup .......................................... 56 12.2 Limit ................................................................ 56 1…

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Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2008000359E 16. EUT TEST SETUP PHOTOGRAPHS Conducted Measurement Photos Radiated Measurement Photos Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-0 07 Ver.：A.0 Page 69 of 70 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2008000359E ※※※※※ END OF REPORT ※※※※※ Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-0 07 Ver.：A.0 Page 70 of 70