2ACP4CBTA335ANC TWS Smart Screen EarBuds

Sentry Industries Limited Covered Equipment Certification Attestation Letter 5/25/2026 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA ATTN.: Reviewing Engineer FCC ID: 2ACP4CBTA335 Sentry Industries Limited (“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. Note: If the equipment for which the applicant seeks authorization is produced by any of the entities identified on the current Covered List, the applicant should include an explanation on why the equipment is not “covered” equipment. Sentry Industries Limited (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Sentry Industries Limited (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Signed: Printed name: Peetu Melwani Title: Manager Company Name: Sentry Industries Limited Date: 5/25/2026

Sentry Industries Limited DATE: May 25, 2026 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 Authority to Act as Agent On our behalf, I appoint Shenzhen Tongzhou Testing Co.,Ltd. (1st Floor, Building 1, Haomai High-tech Park, Huating Road 387, Dalang Street, Longhua, Shenzhen, China) to act as our agent in the preparation of this application for equipment certification. I certify that submitted documents properly describe the device or system for which equipment certification is sought. I also certify that each unit manufactured, imported or marketed, as defined in the Federal Communications Commission’s regulations will have affixed to it a label identical to that submitted for approval with this application. For instances where our authorized agent signs the application for certification on our behalf, I acknowledge that all responsibility for complying with the terms and conditions for certification, still resides with Sentry Industries Limited (Room A9, 7/F K11 Atelier, Victoria Dockside, 18 Salisbury Road, Tsim Sha Tsui, Hong Kong, China) <Signature> Name: Peetu Melwani Title: Manager Applicant Company: Sentry Industries Limited

Date: May 25, 2026 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Compliance Testing, LLC 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). Sincerely, <Signature> Name: Peetu Melwani Title: Manager Company: Sentry Industries Limited

DATE: May 25, 2026 Equipment Autorisation Division Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: 2ACP4CBTA335 Product Name: ANC TWS Smart Screen EarBuds Request for Confidentiality Pursuant to Sections 0.457 and 0.459 of the commission’s rules, we hereby request that the following documents be held confidential: (List here the documents for which you are seeking confidentiality – for example ...) • Schematics • Block diagram • Operation description These materials contain trade secrets and proprietary information and are not customarily released to the public. The public disclosure of this information might be harmful to the company and provide unjustified benefits to our competitors. <Signature> Name: Peetu Melwani Title: Manager Company: Sentry Industries Limited

Sentry Industries Limited Room A9, 7/F K11 Atelier, Victoria Dockside, 18 Salisbury Road, Tsim Sha Tsui, Hong Kong, China Date: 2026/5/25 Dear Sir/Madam, We, Sentry Industries Limited, Hereby declares the following statement, PCB board, circuit, structure and internal of these model(s) are the same, Only model name is different for these model: FCC ID: 2ACP4CBTA335 Product name: ANC TWS Smart Screen EarBuds Model no.: BTA335, BTA300, BTASMART, BTA350, BTASCREEN Sincerely, Name/Title： Peetu Melwani / Manager Company: Sentry Industries Limited Address: Room A9, 7/F K11 Atelier, Victoria Dockside, 18 Salisbury Road, Tsim Sha Tsui, Hong Kong, China Phone: +852-23684777 Fax: +852-23685777 E-Mail: [email protected]

Report No.: TZ0425260405PH02 Page 1 of 5 External Photographs of EUT External Photo 1 External Photo 2 Report No.: TZ0425260405PH02 Page 2 of 5 External Photo 3 External Photo 4 Report No.: TZ0425260405PH02 Page 3 of 5 External Photo 5 External Photo 6 Report No.: TZ0425260405PH02 Page 4 of 5 External Photo 7 External Photo 8 Report No.: TZ0425260405PH02 Page 5 of 5 External Photo 9

The size of the label is 15mm*10mm with White forecolor. The size of the logo is 5mm*5mm. FCC ID: 2ACP4CBTA335

Report No.: TZ0425260405PH03 Page 1 of 6 Internal Photographs of EUT Internal Photo 1 Internal Photo 2 Report No.: TZ0425260405PH03 Page 2 of 6 Internal Photo 3 Internal Photo 4 Bluetooth antenna Report No.: TZ0425260405PH03 Page 3 of 6 Internal Photo 5 Internal Photo 6 Report No.: TZ0425260405PH03 Page 4 of 6 Internal Photo 7 Internal Photo 8 Bluetooth antenna Report No.: TZ0425260405PH03 Page 5 of 6 Internal Photo 9 Internal Photo 10 Report No.: TZ0425260405PH03 Page 6 of 6 Internal Photo 11

FCC ID: 2ACP4CBTA335 Page 1 of 2 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd RADIO FREQUENCY EXPOSURE Limit According to section B.4 of 447498 D04 Interim General RF Exposure Guidance v01 SAR-based thresholds are derived based on frequency, power, and separation distance of the RF source. The formula defines the thresholds in general for either available maximum time-averaged power or maximum time-averaged ERP, whichever is greater. If the ERP of a device is not easily determined, such as for a portable device with a small form factor, the applicant may use the available maximum time-averaged power exclusively if the device antenna or radiating structure does not exceed an electrical length of λ/4. As for devices with antennas of length greater than λ/4 where the gain is not well defined, but always less than that of a half-wave dipole (length λ/2), the available maximum time-averaged power generated by the device may be used in place of the maximum time-averaged ERP, where that value is not known. The separation distance is the smallest distance from any part of the antenna or radiating structure for all persons, during operation at the applicable ERP. In the case of mobile or portable devices, the separation distance is from the outer housing of the device where it is closest to the antenna. The SAR-based exemption formula of § 1.1307(b)(3)(i)(B), repeated here as Formula (B.2), applies for single fixed, mobile, and portable RF sources with available maximum time-averaged power or effective radiated power (ERP), whichever is greater, of less than or equal to the threshold Pth (mW). This method shall only be used at separation distances from 0.5 cm to 40 cm and at frequencies from 0.3 GHz to 6 GHz (inclusive). Pth is given by Formula (B.2). Where and f is in GHz, d is the separation distance (cm), and ERP 20cm is per Formula (B.1). FCC ID: 2ACP4CBTA335 Page 2 of 2 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Results RF Exposure at Separation distance (cm): 0.5 Mode Antenna Frequency [MHz] Conducted Power [dBm] Manufacturing tolerance Antenna Gain [dBi] Max of ERP and Conducted Power including Tune Up SAR- based exemption threshold Pth [mW] Target Power [dBm] Tolerance ±[dB] [dBm] [mW] DH5 Ant1 2402 0.6 0 1 1.25 1 1.26 2.79 DH5 Ant1 2441 0.5 0 1 1.25 1 1.26 2.75 DH5 Ant1 2480 -0.16 -0.5 1 1.25 0.5 1.12 2.72 2DH5 Ant1 2402 2.54 2 1 1.25 3 2.00 2.79 2DH5 Ant1 2441 2.44 2 1 1.25 3 2.00 2.75 2DH5 Ant1 2480 1.6 1 1 1.25 2 1.58 2.72 3DH5 Ant1 2402 3.09 2.5 1 1.25 3.5 2.24 2.79 3DH5 Ant1 2441 2.8 2.5 1 1.25 3.5 2.24 2.75 3DH5 Ant1 2480 2.36 2 1 1.25 3 2.00 2.72 Max of ERP and Conducted Power including Tune Up (dBm) = Max Conducted Tune Up Power(dBm) and Max Conducted Tune Up Power(dBm) + Antenna Gain(dBi)-2.15), whichever is greater. The Maximum Erp is used for Routine Evaluation Exemption according to B.4 of 447498 D04 Interim General RF Exposure Guidance v01. So, the SAR evaluation is not required.

Report No.: TZ0425260405FRF01 Page 1 of 34 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen Tongzhou Testing Co.,Ltd. is acknowledged as copyright owner and source of the material. Shenzhen Tongzhou Testing 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. The test report apply only to the specific sample(s) tested under stated test conditions. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. TEST REPORT Report Number : TZ0425260405FRF01 Product Name : ANC TWS Smart Screen EarBuds Model/Type reference : BTA335, BTA300, BTASMART, BTA350, BTASCREEN FCC ID : 2ACP4CBTA335 Prepared for : Sentry Industries Limited Room A9, 7/F K11 Atelier, Victoria Dockside, 18 Salisbury Road, Tsim Sha Tsui, Hong Kong, China Prepared By : Shenzhen Tongzhou Testing Co.,Ltd. 1st Floor, Building 1, Haomai High-tech Park, Huating Road 387, Dalang Street, Longhua, Shenzhen, China Standards : FCC CFR Title 47 Part 15C, ANSI C63.10-2020+Cor.1-2023 Date of Test : 2026-04-24 ~ 2026-05-08 Date of Issue : 2026-05-08 Prepared by : Nancy Li Reviewed by : Allen Lai Approved by : Max Zhang (Authorized Officer) Report No.: TZ0425260405FRF01 Page 2 of 34 ** Report Revise Record ** Report Version Revise Time Issued Date Valid Version Notes V1.0 / 2026-05-08 Valid Initial release Report No.: TZ0425260405FRF01 Page 3 of 34 TABLE OF CONTENTS 1. G E N E R A L I N F O R M A T I O N ........................................................ 4 1.1. Client Information ................................................................................................................... 4 1.2. Description of Device (EUT) ................................................................................................... 4 1.3. Wireless Function Tested in this Report .............................................................................. 4 1.4. EUT configuration ................................................................................................................... 5 1.5. Description of Test Facility .................................................................................................... 5 1.6. Statement of the Measurement Uncertainty ......................................................................... 5 1.7. Measurement Uncertainty ...................................................................................................... 6 1.8. Description of Test Modes ..................................................................................................... 6 1.9. Frequency of Channels .......................................................................................................... 6 2. T E S T M E T H O D O L O G Y ............................................................ 7 2.1. EUT Configuration .................................................................................................................. 7 2.2. EUT Exercise ........................................................................................................................... 7 2.3. Test Sample ............................................................................................................................. 7 3. S Y S T E M T E S T C O N F I G U R A T I O N .............................................. 8 3.1. Justification ............................................................................................................................. 8 3.2. EUT Exercise Software ........................................................................................................... 8 3.3. Special Accessories ............................................................................................................... 8 3.4. Block Diagram/Schematics .................................................................................................... 8 3.5. Equipment Modifications ....................................................................................................... 8 3.6. Test Setup ................................................................................................................................ 8 4. S U M M A R Y O F T E S T R E S U L T S ................................................. 9 5. M E A S U R E M E N T R E S U L T S ...................................................... 10 5.1. Maximum Peak Conducted Output Power ......................................................................... 10 5.2. Frequency Separation and 20 Db Bandwidth .................................................................... 11 5.3. Number of Hopping Frequency ........................................................................................... 12 5.4. Time of Occupancy (Dwell Time) ......................................................................................... 13 5.5. Conducted Spurious Emissions and Band Edges Test .................................................... 15 5.6. Restricted Band Emission Limit .......................................................................................... 16 5.7. AC Power line conducted emissions .................................................................................. 25 5.8. Band-edge measurements for radiated emissions ........................................................... 28 5.9. Pseudorandom frequency hopping sequence ................................................................... 31 5.10. Antenna requirement ............................................................................................................ 32 6. S U M M A R Y O F T E S T E Q U I P M E N T ............................................ 33 7. T E S T S E T U P P H O T O G R A P H S ................................................. 34 8. E X T E R N A L P H O T O S O F T H E E U T ..…

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Freq Effi Effi Gain Gain UHIS DHIS Max Min irectivitBeamwidth AttH AttV (MHz) (%) (dB) (dBi) (dBd) (%) (%) (dB) (dB) (dBi) (3dB) (dB) (dB) 2400 32.27 -4.91 0.75 -1.4 0 0 0.75 -19.08 4.91 0 47.36 46.86 2410 34.52 -4.62 1.01 -1.14 0 0 1.01 -19.29 4.62 0 47.4 46.9 2420 31.32 -5.04 0.53 -1.62 0 0 0.53 -20 5.04 0 47.28 46.76 2430 29.94 -5.24 0.3 -1.85 0 0 0.3 -22 5.24 0 47.35 46.78 2440 33.08 -4.8 0.66 -1.49 0 0 0.66 -21.42 4.8 0 47.15 46.65 2450 35.3 -4.52 0.9 -1.25 0 0 0.9 -19.23 4.52 0 47.33 46.85 2460 34.55 -4.61 0.77 -1.38 0 0 0.77 -19.74 4.61 0 47.72 47.22 2470 32 -4.95 0.44 -1.71 0 0 0.44 -22.45 4.95 0 47.36 46.93 2480 38.59 -4.14 1.25 -0.9 0 0 1.25 -22.02 4.14 0 47.56 47.1 2490 33.31 -4.77 0.55 -1.6 0 0 0.55 -23.25 4.77 0 47.05 46.67 2500 31.09 -5.07 0.26 -1.89 0 0 0.26 -25.91 5.07 0 47.01 46.63 AdditionalInfor NULL Passive Test For BT2.4 Application Information O4Version 5.245.351 TotalTime 5m 9s 437ms

Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 1 of 56 Appendix Test Data for BT(BDR/EDR) (Conducted Measurement) Product Name: ANC TWS Smart Screen EarBuds Trade Mark: SENTRY Test Model: BTA335 FCC ID: 2ACP4CBTA335 Environmental Conditions Temperature: 23.5°C Relative Humidity: 58% ATM Pressure: 100.0 kPa Test Engineer: Allen Lai Supervised by: Max Zhang NOTE N/A Appendix A: 20dB Emission Bandwidth Test Result Test Mode Antenna Frequency [MHz] 20db EBW [MHz] FL [MHz] FH [MHz] Limit [MHz] Verdict DH5 Ant1 2402 0.960 2401.517 2402.477 --- --- DH5 Ant1 2441 0.960 2440.520 2441.480 --- --- DH5 Ant1 2480 0.960 2479.517 2480.477 --- --- 2DH5 Ant1 2402 1.332 2401.316 2402.648 --- --- 2DH5 Ant1 2441 1.317 2440.325 2441.642 --- --- 2DH5 Ant1 2480 1.326 2479.319 2480.645 --- --- 3DH5 Ant1 2402 1.281 2401.331 2402.612 --- --- 3DH5 Ant1 2441 1.311 2440.337 2441.648 --- --- 3DH5 Ant1 2480 1.311 2479.334 2480.645 --- --- Note: offset(dB) = cable loss(dB) + attenuator factor(dB) Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 2 of 56 Test Graphs DH5-Ant1-2402 DH5-Ant1-2441 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 3 of 56 DH5-Ant1-2480 2DH5-Ant1-2402 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 4 of 56 2DH5-Ant1-2441 2DH5-Ant1-2480 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 5 of 56 3DH5-Ant1-2402 3DH5-Ant1-2441 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 6 of 56 3DH5-Ant1-2480 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 7 of 56 Appendix B: Occupied Channel Bandwidth Test Result Test Mode Antenna Frequency [MHz] OCB [MHz] FL [MHz] FH [MHz] Limit [MHz] Verdict DH5 Ant1 2402 0.84972 2401.5561 2402.4058 --- --- DH5 Ant1 2441 0.86309 2440.5525 2441.4156 --- --- DH5 Ant1 2480 0.85518 2479.5504 2480.4056 --- --- 2DH5 Ant1 2402 1.1754 2401.3955 2402.5709 --- --- 2DH5 Ant1 2441 1.1928 2440.3875 2441.5803 --- --- 2DH5 Ant1 2480 1.1835 2479.3919 2480.5754 --- --- 3DH5 Ant1 2402 1.1745 2401.3975 2402.5720 --- --- 3DH5 Ant1 2441 1.1817 2440.3957 2441.5774 --- --- 3DH5 Ant1 2480 1.1810 2479.3940 2480.5750 --- --- Note: offset(dB) = cable loss(dB) + attenuator factor(dB) Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 8 of 56 Test Graphs DH5-Ant1-2402 DH5-Ant1-2441 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 9 of 56 DH5-Ant1-2480 2DH5-Ant1-2402 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 10 of 56 2DH5-Ant1-2441 2DH5-Ant1-2480 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 11 of 56 3DH5-Ant1-2402 3DH5-Ant1-2441 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 12 of 56 3DH5-Ant1-2480 Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 13 of 56 Appendix C: Maximum peak conducted output power Test Result Test Mode Antenna Frequency [MHz] Conducted Peak Power [dBm] Conducted Limit [dBm] Verdict DH5 Ant1 2402 0.60 ≤30 PASS DH5 Ant1 2441 0.50 ≤30 PASS DH5 Ant1 2480 -0.16 ≤30 PASS 2DH5 Ant1 2402 2.54 ≤20.97 PASS 2DH5 Ant1 2441 2.44 ≤20.97 PASS 2DH5 Ant1 2480 1.60 ≤20.97 PASS 3DH5 Ant1 2402 3.09 ≤20.97 PASS 3DH5 Ant1 2441 2.80 ≤20.97 PASS 3DH5 Ant1 2480 2.36 ≤20.97 PASS Note: offset(dB) = cable loss(dB) + attenuator factor(dB) Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 14 of 56 Test Graphs DH5-Ant1-2402-PASS DH5-Ant1-2441-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 15 of 56 DH5-Ant1-2480-PASS 2DH5-Ant1-2402-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 16 of 56 2DH5-Ant1-2441-PASS 2DH5-Ant1-2480-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 17 of 56 3DH5-Ant1-2402-PASS 3DH5-Ant1-2441-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 18 of 56 3DH5-Ant1-2480-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 19 of 56 Appendix D: Carrier frequency separation Test Result Test Mode Antenna Frequency [MHz] Result [MHz] Limit [MHz] Verdict DH5 Ant1 Hop 0.996 ≥0.960 PASS 2DH5 Ant1 Hop 1.01 ≥0.888 PASS 3DH5 Ant1 Hop 1.004 ≥0.874 PASS Note: offset(dB) = cable loss(dB) + attenuator factor(dB) Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 20 of 56 Test Graphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 21 of 56 3DH5-Ant1-Hop-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 22 of 56 Appendix E: Time of occupancy Test Result Test Mode Antenna Frequency [MHz] Burst Width [ms] TotalHops [Num] Result [s] Limit [s] Verdict DH5 Ant1 Hop 2.904 100 0.29 ≤0.4 PASS 2DH5 Ant1 Hop 2.911 80 0.233 ≤0.4 PASS 3DH5 Ant1 Hop 2.912 130 0.379 ≤0.4 PASS Note: offset(dB) = cable loss(dB) + attenuator factor(dB) Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 23 of 56 Test Graphs DH5-Ant1-Hop-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 24 of 56 2DH5-Ant1-Hop-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 25 of 56 3DH5-Ant1-Hop-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 26 of 56 Appendix F: Number of hopping channels Test Result Test Mode Antenna Frequency [MHz] Result [Num] Limit [Num] Verdict DH5 Ant1 Hop 79 ≥15 PASS 2DH5 Ant1 Hop 79 ≥15 PASS 3DH5 Ant1 Hop 79 ≥15 PASS Note: offset(dB) = cable loss(dB) + attenuator factor(dB) Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 27 of 56 Test Graphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 28 of 56 3DH5-Ant1-Hop-PASS Appendix Test Data of the Report No.: TZ0425260405FRF01 Page 29 of 56 Appendix G: Band edge measurements Test Result Test Mode Antenna Ch.Name Frequency [MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 Low 2402 -0.24 -48.63 ≤-20.24 PASS DH5 Ant1 High 2480 -1.16 -48.58 ≤-21.16 PASS DH5 Ant1 Low Hop_2402 -0.45 -48.91 ≤-20.45 PASS DH5 Ant1 High Hop_2480 -1.25 -48.19 ≤-21.25 PASS 2DH5 Ant1 Low 2402 -0.49 -49 ≤-20.49 PASS 2DH5 Ant1 High 2480 -1.02 -48.71 ≤-21.02 PA…

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Report No.: TZ0425260405PH01 Page 1 of 2 Test Setup Photos of the EUT Radiated Emission Below 1GHz Radiated Emission Above 1GHz Report No.: TZ0425260405PH01 Page 2 of 2 Conducted Emission at AC Port RF Conducted Test