2ALN9-TW92AJ4Truly Wireless Earphones

The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Rev 11/20/07 (TRANSTYLE TECHNOLOGY CO., LIMITED) Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: 2ALN9-TW92AJ4 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)

TRANSTYLE TECHNOLOGY CO., LIMITED Model Difference 2020-1 2-2 8 EUT NAME: Truly Wireless Earphones FCC ID: 2ALN9-TW92AJ4 MODEL : TW92AJ4 MZX5000, MZX5***, MZX5000-CGRY, MZX5000-ICY, MZX5000-PP, MZX5000-M T, MZX5000-RYB, MZX5000-CGRY-STK-6, MZX5000-ICY-STK-6, MZX5000-PP-STK- 6, MZX5000-MT-STK-6, MZX5000-RYB-STK-6, MZX5000-CGRY-WM, MZX5000- ICY-WM, MZX5000-PP-WM, MZX5000-MT-WM, MZX5000-RYB-WM, MZX5000- CGRY-TA, MZX5000-MT-TA, MZX5000-PP-TA, MZX5000-RYB-TA, MZX5000-ICY- TA, MZX5000-CGRY-FR, MZX5000-CGRY-SA, MZX5000-CGRY-STK, MZX5000- MT-FR, MZX5000-MT-SA, MZX5000-MT-STK, MZX5000-RYB-FR, MZX5000-RYB- SA, MZX5000-RYB-STK, MZX5000-PP-FR, MZX5000-PP-SA, MZX5000-PP-STK, MZX5000-ICY-FR, MZX5000-ICY-SA, MZX5000-ICY-STK 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: 2020/11/18 SUBJECT: FCC Application for FCC ID: 2ALN9-TW92AJ4 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-TW92AJ4 Label location Label location

Internal Photos Antenna

RF EXPOSURE EVALUATION METHOD FCC ID: 2ALN9-TW92AJ4 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)：2±1dbm 5.19dBi logarithmic terms convert to numeric result is nearly 3.304. 3dbm=2.00mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=2.00/5*√2.402 =0. 62≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. Modulation Frequency (MHz) Output Power (dBm) Max Antenna Gain (dBi) GFSK 2402 1.131 5.19 GFSK 2441 0.500 5.19 GFSK 2480 0.294 5.19 Pi/4 DQPSK 2402 1.101 5.19 Pi/4 DQPSK 2441 0.442 5.19 Pi/4 DQPSK 2480 0.249 5.19 8DPSK 2402 1.387 5.19 8DPSK 2441 0.769 5.19 8DPSK 2480 0.589 5.19 2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=2.00/5*√2.441 =0. 62≤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)]=2.00/5*√2.48=0. 63≤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.

No.：BCTC/RF-EMC-005 Page: 1 of 70 Edition：A.2 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2011193000-1E Applicant: TRANSTYLE TECHNOLOGY CO., LIMITED Product Name: Truly Wireless Earphones Model/Type Ref.: TW92AJ4 Tested Date: Nov. 20, 2020 to Nov. 28, 2020 Issued Date: Nov. 28, 2020 Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 2 of 70 Edition：A.2 FCC ID: 2ALN9-TW92AJ4 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 BCTC Testing Co., Ltd, this report can’t be reproduced except in full.The tested sample(s) and the sample information are provided by the client. Product Name: Truly Wireless Earphones Trademark: N/A Model/Type Ref.: TW92AJ4 Ref. the section 4.1 Product Information Prepared For: TRANSTYLE TECHNOLOGY CO., LIMITED Address: 1# Building, Dabuxiang Industrial Area, Guanlan Town, Longhua New district, Shenzhen China. 518110 Manufacturer: 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: 1-2/F., East of B Building, Pengzhou Industrial Park, Fuyuan 1st Road, Qiaotou, Fuyong Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Nov. 20, 2020 Sample tested Date: Nov. 20, 2020 to Nov. 28, 2020 Issue Date: Nov. 28, 2020 Report No.: BCTC2011193000-1E Test Standards FCC Part15.247 ANSI C63.10-2013 Test Results PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Willem Wang/Project Handler Zero Zhou/Reviewer Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 3 of 70 Edition：A.2 TABLE OF CONTENT Test Report Declaration Page 1. VERSION ............................................................. 5 2. TEST SUMMARY ...................................................... 6 3. MEASUREMENT UNCERTAINTY........................................ 7 4. PRODUCT INFORMATION AND TEST SETUP ............................ 8 4.1 Product Information ..................................................... 8 4.2 Test Setup Configuration ................................................ 8 4.3 Support Equipment ..................................................... 9 4.4 Channel List ........................................................... 9 4.5 Test Mode ............................................................ 10 4.6 table of parameters of text software setting ................................ 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 EUT operating Conditions .............................................. 13 6.5 Test Result ........................................................... 14 7. RADIATED EMISSIONS ............................................... 16 7.1 Block Diagram Of Test Setup ........................................... 16 7.2 Limit ................................................................. 17 7.3 Test procedure ........................................................ 18 7.4 EUT operating Conditions .............................................. 19 7.5 Test Result ........................................................... 20 8. RADIATED BAND EMISSION MEASUREMENT AND RESTRICTED BANDS OF OPERATION .......................................................... 24 8.1 Block Diagram Of Test Setup ........................................... 24 8.2 Limit ................................................................. 24 8.3 Test procedure ........................................................ 25 8.4 EUT operating Conditions .............................................. 25 8.5 Test Result ........................................................... 26 9. CONDUCTED EMISSION .............................................. 27 9.1 Block Diagram Of Test Setup ........................................... 27 9.2 Limit ................................................................. 27 9.3 Test procedure ........................................................ 27 9.4 Test Result ........................................................... 28 10. 20 DB BANDWIDTH .................................................. 37 10.1 Block Diagram Of Test Setup .......................................... 37 10.2 Limit ................................................................ 37 10.3 Test procedure ....................................................... 37 Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 4 of 70 Edition：A.2 10.4 Test Result .......................................................... 38 11. MAXIMUM PEAK OUTPUT POWER .................................... 43 11.1 Block Diagram Of Test Setup .......................................... 43 11.2 Limit ................................................................ 43 11.3 Test procedure ....................................................... 43 11.4 Test Result .......................................................... 44 12. HOPPING CHANNEL SEPARATION .................................... 49 12.1 Block Diagram Of Test Setup .......................................... 49 12.2 Limit ................................................................ 49 12.3 Test procedure ....................................................... 49 12.4 Test Result .......................................................... 50 13. NUMBER OF HOPPING FREQUENCY .................................. 55 13.1 Block Diagram Of Test Setup ..…

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Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 36 of 70 Edition：A.2 8DPSK Transmitting Band edge-right side 8DPSK Hopping Band edge-right side Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 37 of 70 Edition：A.2 10. 20 DB BANDWIDTH 10.1 Block Diagram Of Test Setup 10.2 Limit N/A 10.3 Test procedure 1. Set RBW = 30kHz. 2. Set the video bandwidth (VBW) ≥ 3 x RBW. 3. Detector = Peak. 4. Trace mode = max hold. 5. Sweep = auto couple. 6. Allow the trace to stabilize. 7. Measure the maximum width of the emission that is constrained by the frequencies associated with the two outermost amplitude points (upper and lower frequencies) that are attenuated by 20 dB relative to the maximum level measured in the fundamental emission. . Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 38 of 70 Edition：A.2 10.4 Test Result Temperature： 26°C Relative Humidity： 54% Test Voltage ： DC 3.7V Remark N/A Modulation Test Channel Bandwidth(MHz) GFSK Low 0.870 GFSK Middle 0.868 GFSK High 0.873 Pi/4 DQPSK Low 1.214 Pi/4 DQPSK Middle 1.212 Pi/4 DQPSK High 1.214 8DPSK Low 1.219 8DPSK Middle 1.216 8DPSK High 1.216 Test plots GFSK Low Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 39 of 70 Edition：A.2 GFSK Middle Channel GFSK High Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 40 of 70 Edition：A.2 Pi/4 DQPSK Low Channel Pi/4 DQPSK Middle Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 41 of 70 Edition：A.2 Pi/4 DQPSK High Channel 8DPSK Low Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 42 of 70 Edition：A.2 8DPSK Middle Channel 8DPSK High Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 43 of 70 Edition：A.2 11. MAXIMUM PEAK OUTPUT POWER 11.1 Block Diagram Of Test Setup 11.2 Limit FCC Part15 (15.247) , Subpart C Section Test Item Limit Frequency Range (MHz) Result 15.247(b)(1) Peak Output Power 0.125 watt or 21dBm 2400-2483.5 PASS 11.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set the spectrum analyzer: RBW = 3MHz. VBW = 3MHz. Sweep = auto; Detector Function = Peak. 3. Keep the EUT in transmitting at lowest, medium and highest channel individually. Record the max value. Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 44 of 70 Edition：A.2 11.4 Test Result Temperature： 26°C Relative Humidity： 54% Test Voltage ： DC 3.7V Remark: N/A Modulation Test Channel Output Power (dBm) Limit (dBm) GFSK Low 1.131 21 GFSK Middle 0.500 21 GFSK High 0.294 21 Pi/4 DQPSK Low 1.101 21 Pi/4 DQPSK Middle 0.442 21 Pi/4 DQPSK High 0.249 21 8DPSK Low 1.387 21 8DPSK Middle 0.769 21 8DPSK High 0.589 21 Test plots GFSK Low Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 45 of 70 Edition：A.2 GFSK Middle Channel GFSK High Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 46 of 70 Edition：A.2 Pi/4 DQPSK Low Channel Pi/4 DQPSK Middle Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 47 of 70 Edition：A.2 Pi/4 DQPSK High Channel 8DPSK Low Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 48 of 70 Edition：A.2 8DPSK Middle Channel 8DPSK High Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 49 of 70 Edition：A.2 12. HOPPING CHANNEL SEPARATION 12.1 Block Diagram Of Test Setup 12.2 Limit Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hopping 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 0.125W. 12.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set the spectrum analyzer: RBW = 30kHz. VBW = 100kHz , Span = 2.0MHz. Sweep = auto; Detector Function = Peak. Trace = Max hold. 3. Allow the trace to stabilize. Use the marker-delta function to determine the separation between the peaks of the adjacent channels. The limit is specified in one of the subparagraphs of this Section Submit this plot. Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 50 of 70 Edition：A.2 12.4 Test Result Modulation Test Channel Separation (MHz) Limit(MHz) Result GFSK Low 1.006 0.580 PASS GFSK Middle 0.998 0.579 PASS GFSK High 0.998 0.582 PASS Pi/4 DQPSK Low 1.000 0.809 PASS Pi/4 DQPSK Middle 1.002 0.808 PASS Pi/4 DQPSK High 1.004 0.809 PASS 8DPSK Low 1.006 0.813 PASS 8DPSK Middle 1.002 0.811 PASS 8DPSK High 0.996 0.811 PASS Test plots GFSK Low Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 51 of 70 Edition：A.2 GFSK Middle Channel GFSK High Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 52 of 70 Edition：A.2 Pi/4 DQPSK Low Channel Pi/4 DQPSK Middle Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 53 of 70 Edition：A.2 Pi/4 DQPSK High Channel 8DPSK Low Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 54 of 70 Edition：A.2 8DPSK Middle Channel 8DPSK High Channel Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 55 of 70 Edition：A.2 13. NUMBER OF HOPPING FREQUENCY 13.1 Block Diagram Of Test Setup 13.2 Limit Frequency hopping systems in the 2400-2483.5 MHz band shall use at least 15 channels. 13.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set the spectrum analyzer: RBW = 100kHz. VBW = 300kHz. Sweep = auto; Detector Function = Peak. Trace = Max hold. 3. Allow the trace to stabilize. It may prove necessary to break the span up to sections. in order to clearly show all of the hopping frequencies. The limit is specified in one of the subparagraphs of this Section. 4. Set the spectrum analyzer: Start Frequency = 2.4GHz, Stop Frequency = 2.4835GH…

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Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 67 of 70 Edition：A.2 17. EUT TEST SETUP PHOTOGRAPHS Conducted emissions Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 68 of 70 Edition：A.2 Radiated Measurement Photos Report No.: BCTC2011193000-1E No.：BCTC/RF-EMC-005 Page: 69 of 70 Edition：A.2