2BBPLTBRETSPWireless Speaker with FM Radio

FCC Warning This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any inte rference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interferenceto radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Reorient or relocate the receiving antenna. · Increase the separation between the equipment and receiver. · Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. · Consult the dealer or an experienced radio/TV technician for help. R adiation Exposure Statement The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Covered Equipment Attestation Letter For Certification Service in the USA Federal Communications Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Section 2.911(d)(5)(i)-(ii) of the Commission’s Rules (47 C.F.R.) we attest as follows for the product listed below: FCC ID Model name 2BBPLTBRETSP TB-RETSP, TB-RETSP-WHT, TB-BTRTRSP, TB- BTRTRSP-BLK, EJ-1460, EJ-1461, EJ-1471 We, Applicant Company Name: TRUSTSTONE GROUP, LLC Address: 1359 Broadway 3rd floor, New York 10018, United States Phone: +1-917-533-5333 certify 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. This includes the cybersecurity and anti-virus software produced or provided by Kaspersky Lab, Inc. or any of ist successors and assignees. We certify 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. If you have any questions, please feel free to contact us at the address shown below. Sincerely, 2025-12-15 Signature Date Name / Title: Marc Faham / CEO Company: TRUSTSTONE GROUP, LLC Address: 1359 Broadway 3rd floor, New York 10018, United States Phone: +1-917-533-5333 Fax: +1-917-533-5333 E-Mail: [email protected]

Due Diligence Letter For Certification Service in the USA Federal Communications Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern FCC ID Model name 2BBPLTBRETSP TB-RETSP, TB-RETSP-WHT, TB-BTRTRSP, TB- BTRTRSP-BLK, EJ-1460, EJ-1461, EJ-1471 Pursuant to KDB 986446 D01 Covered Equipment Guidance the evaluation of the product above shows compliance for the following reasons: Compliance Evaluation process Results Inherent compliance The chipset(s) used is not capable of running the cybersecurity and/or anti-virus software Compliance The memory used does not allow the running the cybersecurity and/or anti-virus software Compliance The storage capacity does not allow the running the cybersecurity and/or anti-virus software Compliance The operating system used is not capable of running the cybersecurity and/or anti-virus software Compliance No inherent compliance Based on software bill of material Based on scan for running software on the device Based on filesystem scan for cybersecurity and/or anti-virus software The equipment for which authorization is sought complies with the rules and fulfils the requirements as detailed in the above mentioned KDB. Evaluation performed by Company Name: Shenzhen LCS Compliance Testing Laboratory Ltd. Contact Name: Martion Lee Address: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Phone: +86-755-82591330 Email: [email protected] Signature: Date: 2025-12-08

Confidentiality Request Letter For Certification Service in the USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Paragraphs §0.457 and 0.459 of the Commission’s Rules (47 C.F.R.) and Section §552(b)(4) of the Freedom of Information Act, we request confidentiality for the documentation of the following products: FCC ID Model name 2BBPLTBRETSP TB-RETSP, TB-RETSP-WHT, TB-BTRTRSP, TB- BTRTRSP-BLK, EJ-1460, EJ-1461, EJ-1471 For the products listed above, we request permanent confidentiality for all applicable exhibits as there are: • the Operational Description • the Block Diagram • the Schematics • the Part List • the Tune up Information The above listed exhibits contain trade secrets and proprietary information that could be of benefit to our competitors. If you have any questions, please feel free to contact us at the address shown below. Sincerely, 2025-12-15 Signature Date Name / Title: Marc Faham / CEO Company: TRUSTSTONE GROUP, LLC Address: 1359 Broadway 3rd floor, New York 10018, United States Phone: +1-917-533-5333 Fax: +1-917-533-5333 E-Mail: [email protected]

TRUSTSTONE GROUP, LLC 1359 Broadway 3rd floor, New York 10018, United States Date: December 15, 2025 FCC ID: 2BBPLTBRETSP Model Number: TB-RETSP, TB-RETSP-WHT, TB-BTRTRSP, TB-BTRTRSP-BLK, EJ-1460, EJ-1461, EJ-1471 To: Federal Communication Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21048 To Whom It May Concern, We, TRUSTSTONE GROUP, LLC hereby declare that our product (Wireless Speaker with FM Radio Model Number: TB-RETSP, TB-RETSP-WHT, TB-BTRTRSP, TB-BTRTRSP-BLK, EJ-1460, EJ-1461, EJ-1471 board, Schematic, Hardware version, Software version, structure and internal photos are same, named differently due to marketing purposes. Should you have any questions or comments regarding this matter, please have my best attention. Sincerely, (Signed) Name / Title: Marc Faham / CEO Company: TRUSTSTONE GROUP, LLC Address: 1359 Broadway 3rd floor, New York 10018, United States Phone: +1-917-533-5333 Fax: +1-917-533-5333 E-Mail: [email protected]

Page 1 of 4 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity External Photos of the EUT Fig. 1 Fig. 2 Page 2 of 4 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Fig. 3 Fig. 4 Page 3 of 4 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Fig. 5 Fig. 6 Page 4 of 4 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Fig. 7

Page 1 of 1 FCC ID:2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity LABEL AND LOCATION (Size: L4.0cm x W3.0cm) Label Location Wireless Speaker with FM Radio Model: TB-RETSP FCC ID: 2BBPLTBRETSP

Page 1 of 5 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Internal Photos of the EUT Fig. 1 Fig. 2 Page 2 of 5 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Fig. 3 Fig. 4 Page 3 of 5 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Fig. 5 Fig. 6 BT ANT Page 4 of 5 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Fig. 7 Fig. 8 Page 5 of 5 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Fig. 9 Fig. 10

Page 1 of 9 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EB Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity RF Exposure Evaluation FOR TRUSTSTONE GROUP, LLC Wireless Speaker with FM Radio Test Model: TB-RETSP Additional Model No.: Please Refer to Page 6 Prepared for : TRUSTSTONE GROUP, LLC Address : 1359 Broadway, 3rd Floor, New York NY 10018 Prepared by : Shenzhen LCS Compliance Testing Laboratory Ltd. Address : 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel : (+86)755-82591330 Fax : (+86)755-82591332 Web : www.LCS-cert.com Mail : [email protected] Date of receipt of test sample : November 26, 2025 Number of tested samples : 2 Sample No. : A251125038-1, A251125038-2 Serial number : Prototype Date of Test : November 26, 2025 ~ December 05, 2025 Date of Report : December 08, 2025 Page 2 of 9 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EB Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity RF Exposure Evaluation Report Reference No. ................. : LCSA11255091EB Date of Issue ................................... : December 08, 2025 Testing Laboratory Name ............ : Shenzhen LCS Compliance Testing Laboratory Ltd. Address ........................................... : 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Testing Location/ Procedure .......... : Full application of Harmonised standards ■ Partial application of Harmonised standards □ Other standard testing method □ Applicant’s Name.......................... : TRUSTSTONE GROUP, LLC Address ........................................... : 1359 Broadway, 3rd Floor, New York NY 10018 Test Specification Standard ......................................... : FCC KDB publication 447498 D01 General RF Exposure Guidance v06 FCC CFR 47 part1 1.1310 FCC CFR 47 part2 2.1093 Test Report Form No. ..................... : TRF-4-E-215 A/0 TRF Originator ................................ : Shenzhen LCS Compliance Testing Laboratory Ltd. Master TRF ..................................... : Dated 2011-03 Shenzhen LCS Compliance Testing Laboratory Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen LCS Compliance Testing Laboratory Ltd. is acknowledged as copyright owner and source of the material. Shenzhen LCS Compliance Testing Laboratory 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 Speaker with FM Radio Trade Mark ..................................... : THROWBACK Test Model ...................................... : TB-RETSP Ratings ............................................ : Please Refer to Page 6 Result ........................................... : PASS Compiled by: Supervised by: Approved by: Jack Liu/ Administrator Kevin Huang/ RF Manager Gavin Liang/ Manager Page 3 of 9 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EB Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity RF Exposure Evaluation 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. Test Report No. : LCSA11255091EB December 08, 2025 Date of issue Test Model.............................. : TB-RETSP EUT...................................... : Wireless Speaker with FM Radio Applicant............................... : TRUSTSTONE GROUP, LLC Address................................... : 1359 Broadway, 3rd Floor, New York NY 10018 Telephone............................... : / Fax.......................................... : / Manufacturer......................... : TRUSTSTONE GROUP, LLC Address................................... : 1359 Broadway, 3rd Floor, New York NY 10018 Telephone............................... : / Fax.......................................... : / Factory ................................. : TRUSTSTONE GROUP, LLC Address ................................. : 1359 Broadway, 3rd Floor, New York NY 10018 Telephone............................... : / Fax.......................................... : / Page 4 of 9 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EB Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Revision History Report Version Issue Date Revision Content Revised By 000 December 08, 2025 Initial Issue --- Page 5 of 9 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EB Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity TABLE OF CONTENTS Description Page 1. Product Information ...............................................................................…

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Product specification Quick Reference Date All the technical data and information contained herein are subject to change without prior notice Antenna Layout & module on the system board Antenna Gain 2.4GHz PCB ANT Antenna typePCB ANT Frequency2.4GHz~2.48GHZ1 Ant. Port Input Pwr. (dBm)0 (Typ. BT class 2 output power) Tot. Rad. Pwr. (dBm)-2.3 (Input pwr – loss pwr) Peak EIRP(dBm)1.7 Directivity (dBi)1(all direction antenna) Efficiency (dB)-2.3 (58.5%) Gain (dBi)1.7 (Peak Gain XZ-plane) Maximum Power (dBm)1.7 (XZ-plane) Minimum Power (dBm)-4(XY-plane) Avg. Power (dBm)-0.5(XY-plane) Max/Min Ratio (dB)5.3(XY-plane) Max/Avg Ratio (dB)1.8(XY-plane) Min/Avg Ratio (dB)-3.5(XY-plane) Average Gain (dB)-0.5 (Avg Gain XY-plane) Unit in dBi @2.44GHz XY-planeXZ-planeYZ-plane Efficiency PeakAvg.PeakAvg.PeakAvg. Module Board 1.3-0.51.7-3.81.1-3.058.5% TRUSTSTONE GROUP, LLC 1359 Broadway, 3rd Floor, New York NY 10018 Model ReturnLoss TheEnvironmentofAntennaRadiationPattern 3Dradiationpatterndiagram XY-planeXZ-planeYZ-plane Far-fieldpowerDistribution(H+V)onY-XPlaneFar-fieldpowerDistribution(H+V)onX-ZPlaneFar-fieldpowerDistribution(H+V)onY-ZPlane PlotpeakGain(H+V)=1.35dbi;plotAvgGain(H+V)[email protected](H+V)=1.68dbi;plotAvgGain(H+V)[email protected](H+V)=1.11dBi;plotAvgGain(H+V)[email protected]

Page 1 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Appendix A RF Test Data for BT (Conducted Measurement) Product Name: Wireless Speaker with FM Radio Test Model: TB-RETSP Environmental Conditions Temperature: 23.7C Relative Humidity: 51.9% ATM Pressure: 100.0 kPa Test Engineer: Jerry Chu Supervised by: Paddi Chen Page 2 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity A.1-20dB Bandwidth Condition Mode Frequency (MHz) Antenna -20 dB Bandwidth (MHz) Limit -20 dB Bandwidth (MHz) Verdict NVNT 1-DH5 2402 Ant1 1.011 0 Pass NVNT 1-DH5 2441 Ant1 0.9542 0 Pass NVNT 1-DH5 2480 Ant1 1.005 0 Pass NVNT 2-DH5 2402 Ant1 1.316 0 Pass NVNT 2-DH5 2441 Ant1 1.279 0 Pass NVNT 2-DH5 2480 Ant1 1.279 0 Pass NVNT 3-DH5 2402 Ant1 1.299 0 Pass NVNT 3-DH5 2441 Ant1 1.299 0 Pass NVNT 3-DH5 2480 Ant1 1.299 0 Pass Page 3 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity -20dB Bandwidth NVNT 1-DH5 2402MHz Ant1 -20dB Bandwidth NVNT 1-DH5 2441MHz Ant1 Page 4 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity -20dB Bandwidth NVNT 1-DH5 2480MHz Ant1 -20dB Bandwidth NVNT 2-DH5 2402MHz Ant1 Page 5 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity -20dB Bandwidth NVNT 2-DH5 2441MHz Ant1 -20dB Bandwidth NVNT 2-DH5 2480MHz Ant1 Page 6 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity -20dB Bandwidth NVNT 3-DH5 2402MHz Ant1 -20dB Bandwidth NVNT 3-DH5 2441MHz Ant1 Page 7 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity -20dB Bandwidth NVNT 3-DH5 2480MHz Ant1 Page 8 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity A.2 Maximum Conducted Output Power Condition Mode Frequency (MHz) Antenna Conducted Power (dBm) Limit Conducted(dBm) Verdict NVNT 1-DH5 2402 Ant1 -1.46 30 Pass NVNT 1-DH5 2441 Ant1 1.09 30 Pass NVNT 1-DH5 2480 Ant1 0.26 30 Pass NVNT 2-DH5 2402 Ant1 -2.04 30 Pass NVNT 2-DH5 2441 Ant1 0.73 30 Pass NVNT 2-DH5 2480 Ant1 -0.37 30 Pass NVNT 3-DH5 2402 Ant1 -1.56 30 Pass NVNT 3-DH5 2441 Ant1 1.19 30 Pass NVNT 3-DH5 2480 Ant1 0.07 30 Pass Page 9 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Power NVNT 1-DH5 2402MHz Ant1 Power NVNT 1-DH5 2441MHz Ant1 Page 10 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Power NVNT 1-DH5 2480MHz Ant1 Power NVNT 2-DH5 2402MHz Ant1 Page 11 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Power NVNT 2-DH5 2441MHz Ant1 Power NVNT 2-DH5 2480MHz Ant1 Page 12 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Power NVNT 3-DH5 2402MHz Ant1 Power NVNT 3-DH5 2441MHz Ant1 Page 13 of 60 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091…

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Page 1 of 37 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity FCC TEST REPORT FOR TRUSTSTONE GROUP, LLC Wireless Speaker with FM Radio Test Model: TB-RETSP Additional Model No.: Please Refer to Page 6 Prepared for : TRUSTSTONE GROUP, LLC Address : 1359 Broadway, 3rd Floor, New York NY 10018 Prepared by : Shenzhen LCS Compliance Testing Laboratory Ltd. Address : 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel : (+86)755-82591330 Fax : (+86)755-82591332 Web : www.LCS-cert.com Mail : [email protected] Date of receipt of test sample : November 26, 2025 Number of tested samples : 2 Sample No. : A251125038-1, A251125038-2 Serial number : Prototype Date of Test : November 26, 2025 ~ December 05, 2025 Date of Report : December 08, 2025 Page 2 of 37 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity FCC TEST REPORT FCC CFR 47 PART 15 C (15.247) Report Reference No. ................. : LCSA11255091EA Date of Issue ................................... : December 08, 2025 Testing Laboratory Name ............ : Shenzhen LCS Compliance Testing Laboratory Ltd. Address ........................................... : 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Testing Location/ Procedure ........... : Full application of Harmonised standards ■ Partial application of Harmonised standards □ Other standard testing method □ Applicant’s Name .......................... : TRUSTSTONE GROUP, LLC Address ........................................... : 1359 Broadway, 3rd Floor, New York NY 10018 Test Specification Standard .......................................... : FCC CFR 47 PART 15 C (15.247) Test Report Form No. ..................... : TRF-4-E-148 A/0 TRF Originator ................................ : Shenzhen LCS Compliance Testing Laboratory Ltd. Master TRF ..................................... : Dated 2011-03 Shenzhen LCS Compliance Testing Laboratory Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen LCS Compliance Testing Laboratory Ltd. is acknowledged as copyright owner and source of the material. Shenzhen LCS Compliance Testing Laboratory 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 Speaker with FM Radio Trade Mark ...................................... : THROWBACK Test Model ...................................... : TB-RETSP Ratings : Please Refer to Page 6 Result ........................................... : PASS Compiled by: Supervised by: Approved by: Jack Liu/ Administrator Kevin Huang/ RF Manager Gavin Liang/ Manager Page 3 of 37 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity FCC -- TEST REPORT 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. Test Report No. : LCSA11255091EA December 08, 2025 Date of issue Test Model.............................. : TB-RETSP EUT...................................... : Wireless Speaker with FM Radio Applicant............................... : TRUSTSTONE GROUP, LLC Address................................... : 1359 Broadway, 3rd Floor, New York NY 10018 Telephone............................... : / Fax.......................................... : / Manufacturer......................... : TRUSTSTONE GROUP, LLC Address................................... : 1359 Broadway, 3rd Floor, New York NY 10018 Telephone............................... : / Fax.......................................... : / Factory ................................. : TRUSTSTONE GROUP, LLC Address ................................. : 1359 Broadway, 3rd Floor, New York NY 10018 Telephone............................... : / Fax.......................................... : / Page 4 of 37 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity Revision History Report Version Issue Date Revision Content Revised By 000 December 08, 2025 Initial Issue --- Page 5 of 37 FCC ID: 2BBPLTBRETSP Report No.: LCSA11255091EA Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: +(86) 0755-82591330 | E-mail: [email protected] | Web: www.lcs-cert.com Scan code to check authenticity TABLE OF CONTENTS Description Page 1. GENERAL INFORMATION ............................................................................................... 6 1.1 Description of Device (EUT) .......................................................…

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Page 1 of 2 FCC ID: 2BBPLTBRETSP Shenzhen LCS Compliance Testing Laboratory Ltd. Add: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Tel: …

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