2BC3X-M8Smart Watch

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Dongguan Langchen Technology Co.,Ltd Covered Equipment Certification Attestation Letter 11/20/2025 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA ATTN.: Reviewing Engineer FCC ID: 2BC3X-M8 Dongguan Langchen 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. Dongguan Langchen 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. Dongguan Langchen 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: Lan Zhou Title: General Manager Company: Dongguan Langchen Technology Co.,Ltd Date: 11/20/2025

Dongguan Langchen 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 11/20/2025 TO: Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 ATTN.: Reviewing Engineer FCC ID: 2BC3X-M8 FRN of applicant: 0034327130 Per section 2.911(d)(7) of the FCC rules, [Dongguan Langchen 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 California 91765- 3921 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: Lan Zhou Title: General Manager Company Name: Dongguan Langchen Technology Co.,Ltd Date: 11/20/2025 Agent Signed (if different from Applicant): Signed: Printed name: Jianfeng Gao Title: Manager Company Name: Herland International Trading Inc Date: 11/20/2025

Dongguan Langchen Technology Co.,Ltd 2025-11-20 Equipment Autorisation Division Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: 2BC3X-M8 Product Name: Smart Watch 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: Lan Zhou Title: General Manager Company: Dongguan Langchen Technology Co.,Ltd

Dongguan Langchen Technology Co.,Ltd 2025-11-20 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 Dongguan Langchen Technology Co.,Ltd（Room 704, No.7 East Second Street, Xingfa South Road, Wusha, Chang'an Town, Dongguan City, Guangdong Province, China） <Signature>: Name: Lan Zhou Title: General Manager Company: Dongguan Langchen Technology Co.,Ltd

Dongguan Langchen Technology Co.,Ltd 2025-11-20 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). <Signature>: Name: Lan Zhou Title: General Manager Company: Dongguan Langchen Technology Co.,Ltd

Dongguan Langchen Technology Co.,Ltd FCC ID: 2BC3X-M8 Product Similarity Declaration Applicant: Dongguan Langchen Technology Co.,Ltd Address: Room 704, No.7 East Second Street, Xingfa South Road, Wusha, Chang'an Town, Dongguan City, Guangdong Province, China Manufacturer: Dongguan Langchen Technology Co.,Ltd Address: Room 704, No.7 East Second Street, Xingfa South Road, Wusha, Chang'an Town, Dongguan City, Guangdong Province, China Product Name: Smart Watch Trade Mark: N/A Model Number: M8, M9 We (Dongguan Langchen 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, appearance color. <Signature>: Name: Lan Zhou Title: General Manager Company: Dongguan Langchen 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. ※※※※※ END OF REPORT ※※※※※

Size: 15*13mm Model.: M8 FCC ID: 2BC3X-M8 Label location

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

FCC ID: 2BC3X-M8 RF Exposure Evaluation According to KDB 447498 D01 V06 and part 2.1093，Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(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 EIRP=E Meas +20log(d Meas )-104.7 EIRP is the equivalent isotropically radiated power, in dBm E Meas is the field strength of the emission at the measurement distance, in dBμV/m d Meas is the measurement distance, in m Here, Peak Output Power (dBm) Max tune-up (mW) Frequency (MHz) Min. distance(mm) Calc. thresholds limit -2.95 0.5 2440 5 0.2 3.0 So a SAR test is not required

Antenna specification 1 Table of contents 2. Antenna appearance and dimensions3. Detailed information about antenna parameters 1. antenna parameters 2 1. antenna parameters 3 Frequency 2402 ～ 2480MHZ Effi AVG 40.22% PK Gain -1.17dBi SWR <3 Antenna Type On board copper Antenna polarization Linear polarizationPART NO B02 Antenna size L12*W0.6mm 2. Antenna appearance and dimensions 4 Antenna No.: B02; Antenna size : L12*W0.6mm 3. Detailed information about antenna parameters 5 Antenna Pattern: Antenna Effeciency S11 Parameters Free space Frequency (MHz) Efficiency (%) Efficiency (dBi) Gain(dBi) 2400 39.6 -5.02 -1.17 2410 40.36 -4.94 -1.29 2420 40.48 -4.93 -1.31 2430 41.32 -4.84 -1.22 2440 41.63 -4.81 -1.29 2450 40.93 -4.88 -1.33 2460 40.08 -4.97 -1.25 2470 39.19 -5.07 -1.29 2480 38.37 -5.16 -1.83 AVG 40.22 -4.96 -1.33 The End 6

Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-251106030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 1 of 33 FCC Part 15C Test Report FCC ID: 2BC3X-M8 Applicant: Dongguan Langchen Technology Co.,Ltd Address: Room 704, No.7 East Second Street, Xingfa South Road, Wusha, Chang'an Town, Dongguan City, Guangdong Province, China Manufacturer: Dongguan Langchen Technology Co.,Ltd Address: Room 704, No.7 East Second Street, Xingfa South Road, Wusha, Chang'an Town, Dongguan City, Guangdong Province, China Product Name: Smart Watch Trade Mark: N/A Model Number: M8, M9 Date of Receipt: Nov. 03, 2025 Test Date: Nov. 03, 2025 - Nov. 13, 2025 Date of Report: Nov. 13, 2025 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-251106030R 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-251106030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 2 of 33 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 20 3.3.1 TEST REQUIREMENT: 20 3.3.2 TEST PROCEDURE 20 3.3.3 DEVIATION FROM TEST STANDARD 20 3.3.4 TEST SETUP 21 3.3.5 EUT OPERATING CONDITIONS 21 3.4 CONDUCTED BAND EDGE EMISSION&CONDUCTED SPURIOUS EMISSIONS MEASUREMENT 23 3.4.1 APPLICABLE STANDARD 23 3.4.2 TEST PROCEDURE 23 3.4.3 DEVIATION FROM STANDARD 23 3.4.4 TEST SETUP 23 Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-251106030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 3 of 33 Table of Contents Page 3.4.5 EUT OPERATION CONDITIONS 23 3.4.6 TEST RESULTS 23 4. . PEAK OUTPUT POWER 26 4.1. APPLIED PROCEDURES / LIMIT 26 4.1.1. TEST PROCEDURE 26 4.1.2. DEVIATION FROM STANDARD 26 4.1.3. TEST SETUP 26 4.1.4. EUT OPERATION CONDITIONS 26 4.1.5. TEST RESULTS 27 5. . POWER SPECTRAL DENSITY TEST 29 5.1. APPLIED PROCEDURES / LIMIT 29 5.1.1. TEST PROCEDURE 29 5.1.2. DEVIATION FROM STANDARD 29 5.1.3. TEST SETUP 29 5.1.4. EUT OPERATION CONDITIONS 29 5.1.5. TEST RESULTS 29 6. . 6DB BANDWIDTH TEST 31 6.1. APPLIED PROCEDURES / LIMIT 31 6.1.1. TEST PROCEDURE 31 6.1.2. DEVIATION FROM STANDARD 31 6.1.3. TEST SETUP 31 6.1.4. EUT OPERATION CONDITIONS 31 6.1.5. TEST RESULTS 31 7. . ANTENNA REQUIREMENT 33 7.1. STANDARD REQUIREMENT 33 7.2. EUT ANTENNA 33 8. . TEST SEUUP PHOTO 33 9. . EUT PHOTO 33 Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-251106030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 4 of 33 1.. SUMMARY OF TEST RESULTS 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) Peak Output Power PASS 15.247(a)(2) 6dB Bandwidth PASS 15.247(e) Power Spectral Density 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 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 6dB Bandwidth ±0.2MHz 9 Power Spectral Density ±0.3dBm Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-251106030R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 5 of 33 2.. GENERAL INFORMATION 2.1. GENERAL DESCRIPTION OF EUT Product Name: Smart Watch Trade Mark: N/A Model Number: M8, M9 Test Model: M8 Model Difference All models are same as the samples except model name and appearance color, they have the same structure and circuit. Operation Frequency: 2402~2480MHz Channel numbers: 40 Channels Channel separation: 1MHz Modulation technology: GFSK Antenna Type: Internal Antenna Antenna gain: -1.17 dBi Power supply: DC 5V DC 3.7V from battery Note: 1.For a more detailed features description, pleas…

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