2A4KG-B10Bookshelf speaker

Shenzhen Zhuoyou Technology Co., Ltd. Covered Equipment Certification Attestation Letter 1/6/2026 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA ATTN.: Reviewing Engineer FCC ID: 2A4KG-B10 Shenzhen Zhuoyou Technology 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. 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. Shenzhen Zhuoyou Technology 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 a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Shenzhen Zhuoyou Technology Co., Ltd. (“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). <Signature>: Name: Zhang huishan Title: Manager Company: Shenzhen Zhuoyou Technology Co., Ltd. Date: 1/6/2026

Shenzhen Zhuoyou Technology Co., Ltd. * the applicant must designate a contact located in the United States for purposes of acting as the applicant’s agent for service of process, regardless of whether the applicant is a domestic or foreign entity. An applicant located in the United States may designate itself as the agent for service of process. U.S. Agent Designation for Service of Process - Certification Attestation Letter 1/6/2026 TO: Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 ATTN.: Reviewing Engineer FCC ID: 2A4KG-B10 FRN of applicant: 0031976772 Per section 2.911(d)(7) of the FCC rules, [Shenzhen Zhuoyou Technology Co., Ltd.] (“the applicant”) certifies that the equipment for which authorization is sought is designated to the following U.S. agent* for service of process: Company Name: Herland International Trading Inc FCC Registration Number (FRN): 0036324101 Physical U.S. Company Address: 1370 Valley Vista Dr Ste 200 Diamond Bar, CA 91765 Contact Person: Jianfeng Gao Agent Email Address: [email protected] The above contact person accepts the obligation for service of process. The applicant accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Applicant Signed: Signed: Printed name: Jing Xiao Title: Manager Company Name: Shenzhen Zhuoyou Technology Co., Ltd. Date: 1/6/2026 Agent Signed (if different from Applicant): Signed: Printed name: Jianfeng Gao Title: Manager Company Name: Herland International Trading Inc Date: 1/6/2026

Shenzhen Zhuoyou Technology Co., Ltd. 2026-01-06 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: Zhang huishan Title: Manager Company: Shenzhen Zhuoyou Technology Co., Ltd.

Shenzhen Zhuoyou Technology Co., Ltd. 2026-01-06 Equipment Autorisation Division Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: 2A4KG-B10 Product Name: Bookshelf speaker 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: Zhang huishan Title: Manager Company: Shenzhen Zhuoyou Technology Co., Ltd.

Shenzhen Zhuoyou Technology Co., Ltd. FCC ID: 2A4KG-B10 Product Similarity Declaration Applicant: Shenzhen Zhuoyou Technology Co., Ltd. Address: 1st Floor, Building 16, Dawangshan Second Industrial Zone, Dawangshan Community, Shajing Street, Baoan District, Shenzhen Manufacturer: Shenzhen Zhuoyou Technology Co., Ltd. Address: 1st Floor, Building 16, Dawangshan Second Industrial Zone, Dawangshan Community, Shajing Street, Baoan District, Shenzhen Product Name: Bookshelf speaker Trade Mark: TECHFROG Model Number: B10, B20, B30, B50, B60, B70, B80, B90 We (Shenzhen Zhuoyou Technology Co., Ltd.) hereby state that all the models are electrical identical including the same software parameter and hardware design (i.e., circuit design, PCB Layout, RF module/circuit, antenna type(s) and antenna location, components on PCB, etc.,), same mechanical structure and design (including product enclosure, materials, etc.,), All models are the same as the samples except for the model name and appearance color. <Signature>: Name: Zhang huishan Title: Manager Company: Shenzhen Zhuoyou Technology Co., Ltd.

Shenzhen Zhuoyou Technology Co., Ltd. 2026-01-06 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 Authority to Act as Agent On our behalf, I appoint Shenzhen DL Testing Technology Co., Ltd.（101-201, Comprehensive Building, Tongzhou Electronics Longgang Factory Area, No.1 Baolong Fifth Road, Baolong Community, Baolong Street, Longgang District, 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 Shenzhen Zhuoyou Technology Co., Ltd.（1st Floor, Building 16, Dawangshan Second Industrial Zone, Dawangshan Community, Shajing Street, Baoan District, Shenzhen） <Signature>: Name: Zhang huishan Title: Manager Company: Shenzhen Zhuoyou Technology Co., Ltd.

Shenzhen DL Testing Technology Co., Ltd. EUT PHOTO(External Photos) Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. ※※※※※ END OF REPORT ※※※※※

Size: 26*22mm Model.: B10 FCC ID: 2A4KG-B10 Label location

Shenzhen DL Testing Technology Co., Ltd. EUT PHOTO(Internal Photos) Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. ANT Shenzhen DL Testing Technology Co., Ltd. ※※※※※ END OF REPORT ※※※※※

FCC ID: 2A4KG-B10 RF Exposure Evaluation Limits The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in KDB 447498 D01 V06 and 1.1307(b) Limits for Maximum Permissible Exposure (MPE) Frequency range (MHz) Electric field strength (V/m) Magnetic field strength (A/m) Power density (mW/cm 2 ) Averaging time (minutes) (A) Limits for Occupational/Controlled Exposures 0.3–3.0 614 1.63 *(100) 6 3.0–30 1842/f 4.89/f *(900/f 2 ) 6 30–300 61.4 0.163 1.0 6 300–1500 f/300 6 1500–100,000 5 6 (B) Limits for General Population/Uncontrolled Exposure 0.3–1.34 614 1.63 *(100) 30 1.34–30 824/f 2.19/f *(180/f 2 ) 30 30–300 27.5 0.073 0.2 30 300–1500 f/1500 30 1500–100,000 1.0 30 f = frequency in MHz Friis transmission formula: Pd = (Pout*G)/(4*pi*r 2 ) Where Pd = power density in mW/cm 2 , Pout = output power to antenna in mW; G = gain of antenna in linear scale, Pi = 3.1416; R = distance between observation point and center of the radiator in cm Pd id the limit of MPE, 1 mW/cm 2 . If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. Test Procedure Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. Test Result of RF Exposure Evaluation For BT Channel Output power to antenna (dBm) Output power to antenna (mW) Power Density at R=20cm (mW/cm 2 ) Limit (mW/cm 2 ) Result 8DPSK 5.55 3.6 0.001 1.0 PASS Remark: antenna gain=1.52 dBi

Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260108030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 1 of 51 FCC Part 15C Test Report FCC ID: 2A4KG-B10 Applicant: Shenzhen Zhuoyou Technology Co., Ltd. Address: 1st Floor, Building 16, Dawangshan Second Industrial Zone, Dawangshan Community, Shajing Street, Baoan District, Shenzhen Manufacturer: Shenzhen Zhuoyou Technology Co., Ltd. Address: 1st Floor, Building 16, Dawangshan Second Industrial Zone, Dawangshan Community, Shajing Street, Baoan District, Shenzhen Product Name: Bookshelf speaker Trade Mark: TECHFROG Model Number: B10, B20, B30, B50, B60, B70, B80, B90 Date of Receipt: Jan. 08, 2026 Test Date: Jan. 08, 2026 - Jan. 22, 2026 Date of Report: Jan. 22, 2026 Prepared By: Shenzhen DL Testing Technology Co., Ltd. Address: 101-201, Comprehensive Building, Tongzhou Electronics Longgang Factory Area, No.1 Baolong Fifth Road, Baolong Community, Baolong Street, Longgang District, Shenzhen, China Applicable Standards: FCC PART 15 C 15.247 ANSI C63.10:2020 Test Result: Pass Report Number: DLE-260108030R Prepared (Test Engineer): Alisa Song Reviewer (Supervisor): Jack Bu Approved (Manager): Jade Yang This test report is based on a single evaluation of one sample of above mentioned products. It is not permitted to be duplicated in extracts without written approval of Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260108030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 2 of 51 Table of Contents Page 1 . SUMMARY OF TEST RESULTS 4 1.1 MEASUREMENT UNCERTAINTY 4 2 . GENERAL INFORMATION 5 2.1 GENERAL DESCRIPTION OF EUT 5 2.2 DESCRIPTION OF TEST MODES 6 2.3 BLOCK DIGRAM SHOWING THE CONFIGURATION OF SYSTEM TESTED 6 2.4 DESCRIPTION OF SUPPORT UNITS(CONDUCTED MODE) 7 2.5 TABLE OF PARAMETERS OF TEST SOFTWARE SETTING 7 2.6 EQUIPMENTS LIST FOR ALL TEST ITEMS 8 3 . EMC EMISSION TEST 9 3.1 CONDUCTED EMISSION MEASUREMENT 9 3.1.1 POWER LINE CONDUCTED EMISSION LIMITS 9 3.1.2 TEST PROCEDURE 9 3.1.3 DEVIATION FROM TEST STANDARD 9 3.1.4 TEST SETUP 10 3.1.5 EUT OPERATING CONDITIONS 10 3.1.6 TEST RESULTS 11 3.2 RADIATED EMISSION MEASUREMENT 13 3.2.1 RADIATED EMISSION LIMITS 13 3.2.2 TEST PROCEDURE 14 3.2.3 DEVIATION FROM TEST STANDARD 14 3.2.4 TEST SETUP 14 3.2.5 EUT OPERATING CONDITIONS 15 3.2.6 TEST RESULTS (BETWEEN 9KHZ – 30 MHZ) 16 3.2.7 TEST RESULTS (BETWEEN 30MHZ – 1GHZ) 17 3.2.8 TEST RESULTS (1GHZ~25GHZ) 19 3.3 RADIATED BAND EMISSION MEASUREMENT 22 3.3.1 TEST REQUIREMENT: 22 3.3.2 TEST PROCEDURE 22 3.3.3 DEVIATION FROM TEST STANDARD 22 3.3.4 TEST SETUP 23 3.3.5 EUT OPERATING CONDITIONS 23 4 . PEAK OUTPUT POWER 35 4.1 APPLIED PROCEDURES / LIMIT 35 4.1.1 TEST PROCEDURE 35 4.1.2 DEVIATION FROM STANDARD 35 4.1.3 TEST SETUP 35 4.1.4 EUT OPERATION CONDITIONS 35 Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260108030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 3 of 51 Table of Contents Page 4.1.5 TEST RESULTS 36 5 . NUMBER OF HOPPING CHANNEL 39 5.1 APPLIED PROCEDURES / LIMIT 39 5.1.1 TEST PROCEDURE 39 5.1.2 DEVIATION FROM STANDARD 39 5.1.3 TEST SETUP 39 5.1.4 EUT OPERATION CONDITIONS 39 5.1.5 TEST RESULTS 39 6 . BANDWIDTH TEST 41 6.1 APPLIED PROCEDURES / LIMIT 41 6.1.1 TEST PROCEDURE 41 6.1.2 DEVIATION FROM STANDARD 41 6.1.3 TEST SETUP 41 6.1.4 EUT OPERATION CONDITIONS 41 6.1.5 TEST RESULTS 42 7 . HOPPING CHANNEL SEPARATION MEASUREMENT 45 7.1 APPLIED PROCEDURES / LIMIT 45 7.1.1 TEST PROCEDURE 45 7.1.2 DEVIATION FROM STANDARD 45 7.1.3 TEST SETUP 45 7.1.4 EUT OPERATION CONDITIONS 45 7.1.5 TEST RESULTS 45 8 . DWELL TIME OF OCCUPANCY 47 8.1 APPLIED PROCEDURES / LIMIT 47 8.1.1 TEST PROCEDURE 47 8.1.2 DEVIATION FROM STANDARD 47 8.1.3 TEST SETUP 47 8.1.4 EUT OPERATION CONDITIONS 47 8.1.5 TEST RESULTS 48 9 . ANTENNA REQUIREMENT 51 9.1 STANDARD REQUIREMENT 51 9.2 EUT ANTENNA 51 10 . TEST SEUUP PHOTO 51 11 . EUT PHOTO 51 Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260108030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 4 of 51 1.. SUMMARY OF TEST RESULTS 1.1. MEASUREMENT UNCERTAINTY The reported uncertainty of measurement y ± U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2，providing a level of confidence of approximately 95 %。 No. Item Uncertainty 1 Conducted Emission Test ±2.56dB 2 RF power,conducted ±0.42dB 3 Spurious emissions,conducted ±2.76dB 4 All emissions,radiated(<1G) ±3.65dB 5 All emissions,radiated(>1G) ±4.89dB 6 Temperature ±0.5°C 7 Humidity ±2% 8 20dB Bandwidth ±0.2MHz Test procedures according to the technical standards: FCC Part15 (15.247) , Subpart C Standard Section Test Item Judgment Remark 15.207 Conducted Emission PASS 15.247(c) Radiated Spurious Emission PASS 15.205 Band Edge Emission PASS 15.247(b)(1) Peak Output Power PASS 15.247(a)(iii) Number of Hopping Frequency PASS 15.247(a)(iii) Dwell Time PASS 15.247(a)(1) Bandwidth PASS 15.247(a)(1) Hopping Channel Separation PASS 15.203 Antenna Requirement PASS NOTE: (1)” N/A” denotes test is not applicable in this Test Report Test lab: Shenzhen DL Testing Technology Co., Ltd. Address: 101-201, Comprehensive Building, Tongzhou Electronics Longgang Factory Area, No.1 Baolong Fifth Road, Baolong Community, Baolong Street, Longgang District, Shenzhen, China FCC Test Firm Registration Number: 854456 Designation Number: CN1307 IC Registered No.: 27485 CAB ID.: CN0118 Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260108030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 5 of 51 2.. GENERAL INFORMATION 2.1. GENERAL DESCRIPTION OF EUT Product Name: Bookshelf speaker Trade Mark: TECHFROG Model Number: B10, B20, B30, B50, B60, B70, B80, B90 Test Model: B10 Model Difference: All models are same as the samples except model name and appearance color, they have the same structure and circui…

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ShenzhenCity LongxunTechnologyCo., Ltd SPECIFICATIONFOR APPROVAL Customer： Shenzhen City Jiayinwuxian Technology Co.,Ltd Address: Room 8071, C Zone, 2nd Floor, Building 2, New City Garden, Dalang South Road, Hualian Community, Longhua Street, Longhua District, Shenzhen City PRODUCTNAME:N8 2.4GAnt Customeritem：2.4G-FPC REV: LX -V1.0 MANUFACTURER SIGNATURE CUSTOMERSIGNATURE CHECKEDBY: APPROVEDBY: DATE: 2025/12 /10 ShenzhenCityLongxunTechnologyCo.,Ltd Contents ltemDescription 1.------------------------------------------------------DeviceConfiguration 2.---------------------------------------------------------------------AntType 3.---------------------------------------------------------------------Matching 4.----------------------------------------------------------------EndProduct 5.----------------------------------------------------------------------V.S.W.R 6.-----------------------------------------------------------------TestReport 7.------------------------------------------MechanicalPerformanceTest 8.-------------------------------------------------------------DurabilityTest ShenzhenCityLongxunTechnologyCo.,Ltd 1.DeviceConfiguration SATIMOMastercontroland Multi-probeMicrowaveDarkroom SATIMOMainenginefront SATMIMOSide Agilent8960 5071BNetworkAnalyzer CMW500SyntheticTEST Shenzhen City Longxun Technology Co., Ltd 1 ．Ant Type BT antenna designed according to customer`s requirements， Center frequency. V.S.W.R ≤ 1.5. 2 ．Matching No Change 3 ．End Product 3 -1 Structure chart ShenzhenCity LongxunTechnologyCo., Ltd 4 ．V.S.W.R 2.4G ShenzhenCity LongxunTechnologyCo., Ltd 5 ．TestReport 5-1、 Passive gain and pattern Freqency(MHz)Gain(dBi)Efficiency(%) 24000.646.44 24100.8549.28 24201. 0951.20 24301. 2052.85 24401. 3755.63 24501. 5256.22 24601. 1353.6 6 24701. 2454.37 24801. 2556.12 24900.9953.10 25000.9853.23 ShenzhenCityLongxunTechnologyCo.,Ltd ShenzhenCityLongxunTechnologyCo.,Ltd ShenzhenCity LongxunTechnologyCo., Ltd ShenzhenCityLongxunTechnologyCo.,Ltd 1 BENDING TEST Theloadonthelineend30CMaway fromthejointis 120g ，Carryout swingtestafterfixingthe joint,Swingleftandright60 degrees，Testtheperformanceafter shakingfor1000times. Aftershakingfor1000times. thetestperformanceisgood . 2STRENGTEST A 15-poundstaticloadisappliedtothe bottomofthepay-offendfor1minute Thereisnosignof electricalandmechanical properties. 3 PULLING FORCE Testthetensionbetweenthejoint andthewirewithatensionmeter. Thereisnosignof electricalandmechanical properties.,Thetensilecan be0.5 Kg . 4 VIBRATION TEST VibrateintheX-axis directionfor120minutes, intheY-axisdirectionfor 120minutesandintheZ-axis directionfor240minutesat avibrationfrequency of1.10Mandamplitudeof 33.30H/sec, Thereisnosignof electricalandmechanical properties. 7.DurabilityTest Distilledwateraccordingto GB1266-86standard：once distillation Allcharacteristic rangeis30%of theinitialvalue 1SAITSPRAY TEST PH6.5~7 Sprayquantity： 1.4me80cm²/h Atmosphericpressure： 1Kgf/cm² Experimentalrelativity：98° Temperature： 45°~47° Pressureand temperature： 35° TestTime： 24 hr 2 HEAT TEST 85 ± 2 °C for24hours,afterkeepinnormal conditionfor30mimthetotest. ShenzhenCityLongxunTechnologyCo.,Ltd 3 HUMIDITY TEST On40+2°C90-95%RHfor24hours,afterkeep innormalconditionfor30mimthetotest . -40 ± 2 °C for96hours,afterkeepinnormal conditionfor30mimthetotest . 4 COLD TEST

Shenzhen DL Testing Technology Co., Ltd. EUT TEST PHOTO Radiated Measurement Photos Shenzhen DL Testing Technology Co., Ltd. Conducted Measurement Photos ※※※※※ END OF REPORT ※※※※※