2A3OB-R18Smart Ring

SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Room 215, Comprehensive Building, Anxu Business Park, No.35-1, Xiangyin Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen ,China Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 2024-8-2 To whom it may concern: We, SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD., hereby certify that the equipment for which authorization is sought (FCC ID: 2A3OB-R18) is not “covered” equipment prohibited from receiving an equipment authorization pursuant to § 2.903 of the FCC rules. We also certify that, as of the date of the filing of the application, we are not identified on the Covered List (https://www.fcc.gov/supplychain/coveredlist) as an entity producing “covered” equipment. By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(b) and (d)(5) and (6). The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. Sincerely, {新申请人签名} Signature Wen xing Liu Manager SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. 62_[model] CoveredEqu_2.911(d)(5)(i) and (ii)-U, V03

SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Room 215, Comprehensive Building, Anxu Business Park, No.35-1, Xiangyin Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen ,China Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 2024-8-2 U.S. Agent Designation SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment for which authorization is sought (FCC ID: 2A3OB-R18): Name and company of U.S. agent:ACT Lab LLC Physical U.S. address of agent:3280 East 59th Street Long Beach, CA 90805 United States FRN of U.S. agent:0033465568 Email address of U.S. agent:[email protected] ACT Lab LLC acknowledges their obligation to accept service of process on behalf of SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD.. SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. with the FRN [0031629223] accepts its obligation to maintain an agent for service of process in the United States for no less than one year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(d)(7). The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. An expiration date for this letter does not exist. In case the U.S. agent changes, the grantee is obligated to notify the FCC within 30 days via the granting TCB. Sincerely, {新申请人签名} Signature Wen xing Liu Manager SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. {代理商签名} Signature Scott Huber Senior Technical Director ACT Lab LLC 48_[model] US_Agent_2.911(d)(7)-U, V05

SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Add: Room 215, Comprehensive Building, Anxu Business Park, No.35-1, Xiangyin Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen ,China Date: 2024-8-2 FCC ID: 2A3OB-R18 Dear Sir/Madam, We, SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Hereby declares the following statement for Federal Communications Commission, PCB board, circuit, structure and internal of these model(s) are the same, Only model number is different for these model: Product name: Smart Ring Model no.: R18, R01, R02, R03, R05, R06, R07, R08, R12, R16 Sincerely, {新申请人签名} Name/Title： Wen xing Liu/Manager Company: SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Address: Room 215, Comprehensive Building, Anxu Business Park, No.35-1, Xiangyin Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen ,China Phone: +0755-28506705 Fax: N/A E-Mail: [email protected]

CONFIDENTIALITY REQUEST for Certification Service in USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 Date:<2024-8-2> 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 requests confidentiality for the following products: FCC IDModel name 2A3OB-R18R18 For the product stated above, we request that the following information be held confidential; Exhibits Long-Term Confidentiality Short-Term Confidentiality Short-Term Confidentiality Days External Photos Internal Photos Block Diagram Schematics Test Setup Photos User’s Manual Parts List Tune Up Operational Descriptions The long-term confidentiality exhibits contain our trade secrets and proprietary information that could be of benefit to our competitors. The short-term confidentiality on the basis of ensuring that business sensitive information remains confidential until the actual marketing of our new device. If you have any questions, please feel free to contact me at the address shown below. Sincerely, {新申请人签名} Name/Title： Wen xing Liu/Manager Company: SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Address: Room 215, Comprehensive Building, Anxu Business Park, No.35-1, Xiangyin Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen ,China Phone: +0755-28506705 Fax: N/A E-Mail: [email protected]

SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Room 215, Comprehensive Building, Anxu Business Park, No.35-1, Xiangyin Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen ,China Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 2024-8-2 To whom it may concern: We, the undersigned, hereby authorize Eurofins Product Service GmbH to act on our behalf in all matters relating to applications for equipment authorization FCC ID: 2A3OB-R18 including the signing of all documents related to these matters. Any and all acts carried out by Eurofins Product Service GmbH on our behalf shall have the same effect as acts of our own. By signing this application form, we agree to Eurofins’ current valid General Terms and Conditions (AGB),Testing and Certification Regulations (PZO) which can be viewed on following website www.eurofins.de/ee or retrieved on request. We also hereby certify that no party to this application is subject to a denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. Sincerely, {新申请人签名} Name/Title： Wen xing Liu/Manager Company: SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Address: Room 215, Comprehensive Building, Anxu Business Park, No.35-1, Xiangyin Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen ,China Phone: +0755-28506705 Fax: N/A E-Mail: [email protected]

FCC ID: 2A3OB-R18 TB-RF-074-1.0 Appendix III EUT External Photographs Photo 1 Appearance of EUT Photo 2 Appearance of EUT FCC ID: 2A3OB-R18 TB-RF-074-1.0 Photo 3 Appearance of EUT Photo 4 Appearance of EUT FCC ID: 2A3OB-R18 TB-RF-074-1.0 Photo 5 Appearance of EUT

FCC ID: 2A3OB-R18 TB-RF-074-1.0 Appendix I Label Appendix II Label Location FCC ID: 2A3OB-R18 Model: R18

FCC ID: 2A3OB-R18 TB-RF-074-1.0 Appendix IV EUT Internal Photographs Photo 6 Internal of EUT Photo 7 Appearance of PCB BT Antenna FCC ID: 2A3OB-R18 TB-RF-074-1.0 Photo 8 Appearance of PCB Photo 9 Battery Appearance

Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202407-0171-1 Page: 1 of 3 TB-RF-074-1.0 1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China Tel: +86 75526509301 Fax: +86 75526509195 Maximum Permissible Exposure Evaluation FCC ID: 2A3OB-R18 1. General Information about EUT 1.1 Client Information Applicant : SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Address : Room 215, Comprehensive Building, Anxu Business Park, No.35- 1, Xiangyin Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen ,China Manufacturer : SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Address : Room 215, Comprehensive Building, Anxu Business Park, No.35- 1, Xiangyin Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen ,China 1.2 General Description of EUT (Equipment Under Test) EUT Name : Smart Ring Models No. : R18, R01, R02, R03, R05, R06, R07, R08, R12, R16 Model Different : All these models are identical in the same PCB, layout and electrical circuit, The only difference is model name, brand name and product name. Brand Name : N/A Sample ID : HC-C-202407-0171-01-01 Product Description : Operation Frequency: BLE: 2402MHz~2480MHz Antenna Gain: 0dBi PFA Antenna Power Rating : USB Input: DC 5V DC 3.7V 18mAh Rechargeable Li-ion battery Software Version : V 1.8.4 Hardware Version : Z01-V12 Remark: The above antenna information is declared by manufacturer and for more detailed features description, please refer to the manufacturer's specifications, the laboratory shall not be held responsible. Report No.: TBR-C-202407-0171-1 Page: 2 of 3 TB-RF-074-1.0 SAR Test Exclusion Calculations 1. FCC: According to KDB 447498 D01 Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies v06. (1) Clause 4.3: General SAR test reduction and exclusion guidance Sub clause 4.31: Standalone SAR test exclusion considerations 1) The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6GHz at test separation distance≤5 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation, mm)]*[√ f (GHz) ] ≤3.0 for 1-g SAR [(max. power of channel, including tune-up tolerance, mW)/(min. test separation, mm)]*[√ f (GHz) ] ≤7.5.0 for 10-g SAR 2. Summary simultaneous transmission for SAR Exclusion The SAR exemption limits outlined in clause 4.3.2(b) of KDB 447498 have been derived based on an approximate SAR value of 0.4 W/kg using half-wave dipole antennas Footnote 1. As such, when simultaneous transmitter SAR evaluations include transmitters that have been exempt from routine SAR evaluation, the SAR must be estimating based on the ratio between the maximum tune-up tolerance limit of the transmitter that has been exempt and the exemption limit at the specific distance and frequency for that transmitter. This ratio must be multiplied by 0.4 W/kg (2.0 W/kg for controlled use and 1.0 W/kg for limb worn devices) in order to calculate the estimated SAR level. The estimate SAR value is calculated based the following equation: (maximum power level including tune-up tolerance for transmitter A / maximum power level of exemption at the same frequency and distance) * 0.4W/kg The [∑ of (the highest measured or estimated SAR for each standalone antenna configuration, adjusted for maximum tune-up tolerance) / 1.6 W/kg] + [∑ of MPE ratios] is ≤ 1.0. The SAR to peak location separation ratios of all simultaneously transmitting antenna pairs operating in portable device exposure conditions are all ≤ 0.04, and the [∑ of MPE ratios] is ≤ 1.0. Report No.: TBR-C-202407-0171-1 Page: 3 of 3 TB-RF-074-1.0 3. Calculation: Test separation: 5mm BLE 1M Frequency (GHz) Conducted Power (dBm) Turn-up Power Tolerance (dB) Max power of tune up tolerance (dbm) Max power of tune up tolerance (mw) Calculation Value Threshold Value 2402 3.806 3±1 4 2.512 0.779 3.0 2440 3.707 3±1 4 2.512 0.785 3.0 2480 2.118 3±1 4 2.512 0.791 3.0 Conclusion: The measurement results comply with the FCC Limit per 47 CFR 2.1093 for the uncontrolled RF Exposure and SAR Exclusion Threshold per KDB 447498 v06. -----END OF REPORT-----

Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 1 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 RF Test Data for Bluetooth LE (Conducted Measurements) General Description of EUT Product Name: Smart Ring Test Model: R18 Sample ID: HC-C-202407-0171-01-01 Environmental Conditions Temperature: 24.6°C Relative Humidity: 52.4% Test Voltage: DC 3.7V Test Engineer: Jolin Lee Note: For a more detailed features description, please refer to the report TBR-C-202407-0171-9 The report only show the worst case data. Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 2 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 Contents 1. Duty Cycle ........................................................................................................................................................................................... 3 2. Maximum Conducted Output Power ................................................................................................................................................. 6 3. -6dB Bandwidth .................................................................................................................................................................................. 9 4. Occupied Channel Bandwidth ......................................................................................................................................................... 12 5. Maximum Power Spectral Density Level ......................................................................................................................................... 15 6. Band Edge ........................................................................................................................................................................................ 18 7. Conducted RF Spurious Emission .................................................................................................................................................. 21 8. Restrict Band .................................................................................................................................................................................... 25 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 3 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 1. Duty Cycle Condition Mode Frequency (MHz) Antenna Duty Cycle (%) Correction Factor (dB) 1/T (kHz) NVNT BLE 1Mbps 2402 Ant1 64.52 1.9 2.5 NVNT BLE 1Mbps 2440 Ant1 63.49 1.97 2.5 NVNT BLE 1Mbps 2480 Ant1 64.52 1.9 2.5 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 4 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 Test Graphs Duty Cycle NVNT BLE 1Mbps 2402MHz Ant1 Duty Cycle NVNT BLE 1Mbps 2440MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 5 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 Duty Cycle NVNT BLE 1Mbps 2480MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 6 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 2. Maximum Conducted Output Power Condition Mode Frequency (MHz) Antenna Total Power (dBm) Limit (dBm) Verdict NVNT BLE 1Mbps 2402 Ant1 3.806 30 Pass NVNT BLE 1Mbps 2440 Ant1 3.707 30 Pass NVNT BLE 1Mbps 2480 Ant1 2.118 30 Pass Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 7 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 Test Graphs Power NVNT BLE 1Mbps 2402MHz Ant1 Power NVNT BLE 1Mbps 2440MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 8 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 Power NVNT BLE 1Mbps 2480MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 9 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 3. -6dB Bandwidth Condition Mode Frequency (MHz) Antenna -6 dB Bandwidth (MHz) Limit -6 dB Bandwidth (MHz) Verdict NVNT BLE 1Mbps 2402 Ant1 0.67 0.5 Pass NVNT BLE 1Mbps 2440 Ant1 0.66 0.5 Pass NVNT BLE 1Mbps 2480 Ant1 0.66 0.5 Pass Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 10 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 Test Graphs -6dB Bandwidth NVNT BLE 1Mbps 2402MHz Ant1 -6dB Bandwidth NVNT BLE 1Mbps 2440MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 11 of 27 FCC ID: 2A3OB-R18 TB-RF-074-1.0 -6dB Bandwidth NVNT BLE 1Mbps 2480MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202407-0171-9 Page: 12 of 27 FCC ID: 2A3OB-R18 T…

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Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202407-0171-9 Page: 1 of 32 TB-RF-074-1.0 1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China Tel: +86 75526509301 Fax: +86 75526509195 Radio Test Report FCC ID: 2A3OB-R18 Report No. : TBR-C-202407-0171-9 Applicant : SHENZHEN ZHISUIXING ELECTRONIC TECHNOLOGY CO., LTD. Equipment Under Test (EUT) EUT Name : Smart Ring Model No. : R18 Series Model No. : R01, R02, R03, R05, R06, R07, R08, R12, R16 Brand Name : N/A Sample ID : HC-C-202407-0171-01-01&HC-C-202407-0171-02-01 Receipt Date : 2024-07-22 Test Date : 2024-07-22 to 2024-07-30 Issue Date : 2024-07-30 Standards : FCC Part 15 Subpart C 15.247 Test Method : ANSI C63.10: 2013 KDB 558074 D01 15.247 Meas Guidance v05r02 Conclusions : PASS In the configuration tested, the EUT complied with the standards specified above. Test By : Jolin Lee Reviewed By : Henry Huang Approved By : Ivan Su This report details the results of the testing carried out on one sample. The results contained in this test report do not relate to other samples of the same product. The manufacturer should ensure that all products in series production are in conformity with the product sample detailed in the report. Report No.: TBR-C-202407-0171-9 Page: 2 of 32 TB-RF-074-1.0 Contents CONTENTS ............................................................................................................................................ 2 1. GENERAL INFORMATION ABOUT EUT ............................................................................. 5 1.1 Client Information ................................................................................................................ 5 1.2 General Description of EUT (Equipment Under Test) ................................................... 5 1.3 Block Diagram Showing the Configuration of System Tested ...................................... 6 1.4 Description of Support Units .............................................................................................. 7 1.5 Description of Test Mode ................................................................................................... 7 1.6 Description of Test Software Setting ................................................................................ 8 1.7 Measurement Uncertainty .................................................................................................. 8 1.8 Test Facility........................................................................................................................... 9 2. TEST SUMMARY..................................................................................................................... 10 3. TEST SOFTWARE .................................................................................................................. 10 4. TEST EQUIPMENT AND TEST SITE .................................................................................. 11 5. CONDUCTED EMISSION ...................................................................................................... 13 5.1 Test Standard and Limit ................................................................................................... 13 5.2 Test Setup........................................................................................................................... 13 5.3 Test Procedure .................................................................................................................. 13 5.4 Deviation From Test Standard......................................................................................... 14 5.5 EUT Operating Mode ........................................................................................................ 14 5.6 Test Data............................................................................................................................. 14 6. RADIATED AND CONDUCTED UNWANTED EMISSIONS ............................................ 15 6.1 Test Standard and Limit ................................................................................................... 15 6.2 Test Setup........................................................................................................................... 16 6.3 Test Procedure .................................................................................................................. 17 6.4 Deviation From Test Standard......................................................................................... 18 6.5 EUT Operating Mode ........................................................................................................ 18 6.6 Test Data............................................................................................................................. 18 7. RESTRICTED BANDS AND BAND EDGE REQUIREMENT .......................................... 19 7.1 Test Standard and Limit ................................................................................................... 19 7.2 Test Setup........................................................................................................................... 19 7.3 Test Procedure .................................................................................................................. 20 7.4 Deviation From Test Standard......................................................................................... 20 7.5 EUT Operating Mode ........................................................................................................ 20 7.6 Test Data............................................................................................................................. 20 8. BANDWIDTH TEST................................................................................................................. 21 8.1 Test Standard and Limit ................................................................................................... 21 8.2 Test Setup.…

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FCC ID: 2A3OB-R18 TB-RF-074-1.0 Appendix V EUT Test Photographs Photo of Setup for Conducted Emission(AC POWER) Photo of Setup for Radiated Emission (30MHz~1GHz) FCC ID: 2A3OB-R18 TB-RF-074-1.0 Photo of Setup for Radiated Emission (Above 1 GHz) -----END OF REPORT-----