2BK7V-BST02Smart ring counter

Shenzhen Shuimuxin Technology Co., Ltd Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: September 24, 2024 FCC ID: 2BK7V-BST02 Ref. #1: Attestation Statements Part 2.911(d)(5)(i) Filing Shenzhen Shuimuxin Technology Co., Ltd 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. Ref. #2: Attestation Statements Part 2.911(d)(5)(ii) Filing Shenzhen Shuimuxin Technology Co., Ltd certifies 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. Applicant: Shenzhen Shuimuxin Technology Co., Ltd Address: Floor 3, Building 3, No. 14, Chuangye Road, Shilong Community, Shiyan Street, Baoan District, Shenzhen China Contact Person: Zangjun You Tel.: 13316547796 Email: [email protected] Sincerely, Signature:

Shenzhen Shuimuxin Technology Co., Ltd U.S. Agent Letter of Attestation To: Federal Communications Commission 7435 Oakland Mills Road, Columbia, MD 21046, USA Date: September 24, 2024 Ref: Attestation Statement – Part 2.911(d)(7) filing FCC ID: 2BK7V-BST02 Shenzhen Shuimuxin Technology Co., Ltd(“the applicant”) certifies that, as of the date of the filing of the application, CLF Import and Export Limited (“the agent”) is our designated U.S. agent for service of process for the above reference FCC ID. The applicant accepts 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. The applicant further acknowledges it is our responsibility to inform the FCC whenever the agent information changes. CLF Import and Export Limited ("the agent) understand it is the agent's obligation to accept service of process in the United States for matters related to the applicable equipment, and at the physical U.S. address and email address. Designated U.S. Agent Company Name: CLF Import and Export Limited FRN: 0033489683 Address: 1312 17th Street #692, Denver, CO 80202, United States Signature: Contact Person: David Chen Tel: +1 949 254 2565 Email: [email protected] Applicant Company Name: Shenzhen Shuimuxin Technology Co., Ltd FRN: 0035968916 Address: Floor 3, Building 3, No. 14, Chuangye Road, Shilong Community, Shiyan Street, Baoan District, Shenzhen China Signature: Contact Person: Zangjun Yuo Tel: 13316547796 Email: [email protected]

SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 1 OF 10 3.2 x 1.6 x 0.5(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification 1.Product Number 412, Building 7, Phase II, Nanshan Yungu Pioneer Park, No. 2, Pingshan Road, Pingshan Community, Taoyuan Street, Nanshan District, Shenzhen (1)Product TypeChip Antenna (2)Size Code3.6x1.2x0.5mm (3)Type CodeF8 (4)PackingPaper bag packaging (5)Frequency2.45GHz YF 3216 F8 R 2G4502 1 2 34 5 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 2 OF 10 3.Applications *Bluetooth earphone systems *Hand-held devices when WiFi /Bluetooth functions are needed, e.g., Smart phone. *IEEE802.11 b/g/n *ZigBee *Wireless PCMCIA cards or USB dongle 4.Description Ying feng chip antenna series are specially designed for WiFi/Bluetooth applications. Based on yingfeng proprietary design and processes, this chip antenna has excellent stability and sensitivity to consistently provide high signal reception efficiency. 5.Electrical Specifications (40 x 40 mm 2 ground plane) 5-1. Electrical Table Characteristics Specifications Unit Outline Dimensions 3.2x1.6x0.5 mm Working Frequency 2400~2500 MHz VSWR 2 Max. Impedance 50  Polarization Linear Polarization Gain Peak 5.29 (typical)dBi Efficiency 73 (typical) % 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 3 OF 10 5-2. Return Loss & VSWR Return Loss (S 11 ) Smith Chart(S 11 ) 6 Outline Dimensions of Antenna & Evaluation Board (unit: mm) 6-1. Antenna Dimensions Configuration and Dimensions: 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 4 OF 10 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 5 OF 10 7.Radiation Pattern (40x 40 mm 2 ground plane) 7-1. 3D Gain Pattern @ 2450 MHz Z X Y Y X Z 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 6 OF 10 、 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 7 OF 10 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 8 OF 10 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 9 OF 10 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : harry Designed by : andy Checked by : andy Approved by：oliver TITLE：3.2x1.6 x 0.5mm) WiFi/Bluetooth Ceramic Chip Antenna (YF300K) Engineering Specification DOCUMENT YF3216F8R2G4502 REV. NO. B PAGE 10 OF 10

Shenzhen Shuimuxin Technology Co., Ltd Date：September 24, 2024 Product Model Number: BST02, BW01, BST01, BST03 FCC ID：2BK7V-BST02 To whom it may concern, Re: Product Certification Representative Authorization Letter We authorize QAI Laboratories Ltd. 3980 North Fraser Way, Burnaby B.C. Canada V5J 5K5 to act on our behalf on all matters concerning the above named equipment. This shall include the following: • Testing • Approval applications and procedures We declare that QAI Laboratories Ltd. is allowed to forward all information related to the approval project to the applied certification body and to the notification entities and to discuss any issues concerning the approval application. Any and all acts carried out by QAI Laboratories Ltd. on our behalf shall have the same effect as acts of our own. By: Zangjun Yuo Contact Listed on FCC Wesbite Title: Manager Email: [email protected] Telephone: 13316547796 On behalf of: Shenzhen Shuimuxin Technology Co., Ltd

Shenzhen Shuimuxin Technology Co., Ltd Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: September 24, 2024 Subject; Request for Confidentiality FCC ID: 2BK7V-BST02 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure Software Security Requirements for UNII devices In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Zangjun Yuo Title: Manager

Shenzhen Shuimuxin Technology Co., Ltd Model Difference Statement Dear Sir/Madam, Added models BW01, BST01, BST03 basis of the original product BST02. The color of appearance and model name of series models listed are different from the main model, but the circuit and the electronic construction are the same, declared by the manufacturer. Sincerely, Name: Zangjun Yuo Title: Manager Company name: Shenzhen Shuimuxin Technology Co., Ltd Address: 3rd, 4th and 5th floor, No. 101, Huli Industrial Park, Meixi Road, Tong'an District, Xiamen City China

Report No: SSP24090079-1E FCC ID: 2BK7V-BST02 Annex of Test Report Annex A. EUT External Photos EUT View 1 EUT View 2 Report No: SSP24090079-1E FCC ID: 2BK7V-BST02 Annex of Test Report EUT View 3 EUT View 4 Report No: SSP24090079-1E FCC ID: 2BK7V-BST02 Annex of Test Report EUT View 5 EUT View 6 Report No: SSP24090079-1E FCC ID: 2BK7V-BST02 Annex of Test Report EUT View 7

Report No: SSP24090079-1E FCC ID: 2BK7V-BST02 Annex of Test Report Annex D. Label and Information FCC Label Sample FCC Label Specifications Text is Black in color and is justified. Labels are printed in indelible ink on permanent adhesive backing or silk-screened onto the EUT or shall be affixed at a conspicuous location on the EUT. Where the EUT is constructed in two or more sections connected by wires and marketed together, the above statement is required to be affixed only to the main control unit. When the EUT is so small or for such use that it is not practicable to place the statement on it, the above information shall be placed in a prominent location in the instruction manual or pamphlet supplied to the user or, alternatively, shall be placed on the container in which the device is marketed. FCC Label Location

FCC ID: 2BK7V-BST02 RF Exposure Evaluation According to KDB 447498 D01 General RF Exposure Guidance 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 Here, The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction. For BR+EDR Max Conducted Power(dBm) Tune-up Power(dBm) Max Tune-up Power(dBm) Max Power(mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit -2.17 -2(±1) -1 0.79 2480 5 0.248818 3.0 So a SAR test is not required

CCUT Testing & Certification Report No: SSP24090079-1E FCC Test Report Page 1 of 32 FCC TEST REPORT FCC ID: 2BK7V-BST02 Report No. : SSP24090079-1E Applicant : Shenzhen Shuimuxin Technology Co., Ltd Product Name : Smart ring counter Model Name : BST02 Test Standard : FCC Part 15.247 Date of Issue : 2024-09-19 Shenzhen CCUT Quality Technology Co., Ltd. 1F, Building 35, Changxing Technology Industrial Park, Yutang Street, Guangming District, Shenzhen, Guangdong, China; (Tel.:+86-755-23406590 website: www.ccuttest.com) This test report is limited to the above client company and the product model only. It may not be duplicated without prior permitted by Shenzhen CCUT Quality Technology Co., Ltd. CCUT Testing & Certification Report No: SSP24090079-1E FCC Test Report Page 2 of 32 Test Report Basic Information Applicant..................................: Shenzhen Shuimuxin Technology Co., Ltd Address of Applicant...............: Floor 3, Building 3, No. 14, Chuangye Road, Shilong Community, Shiyan Street, Baoan District, Shenzhen China Manufacturer..........................: Shenzhen Shuimuxin Technology Co., Ltd Address of Manufacturer........: Floor 3, Building 3, No. 14, Chuangye Road, Shilong Community, Shiyan Street, Baoan District, Shenzhen China Product Name.........................: Smart ring counter Brand Name.............................: BSTWSH Main Model..............................: BST02 Series Models..........................: BW01, BST01, BST03 Test Standard..........................: FCC Part 15 Subpart C KDB558074 D01 15.247 Meas Guidance v05r02 ANSI C63.4-2014 ANSI C63.10-2013 Date of Test .............................: 2024-09-10 to 2024-09-13 Test Result...............................: PASS Tested By ................................: (Colin Chen) Reviewed By............................: (Lieber Ouyang) Authorized Signatory............: (Lahm Peng) Note : This test report is limited to the above client company and the product model only. It may not be duplicated without prior permitted by Shenzhen CCUT Quality Technology Co., Ltd.. All test data presented in this test report is only applicable to presented test sample. CCUT Testing & Certification Report No: SSP24090079-1E FCC Test Report Page 3 of 32 CONTENTS 1. General Information .................................................................................................................................................... 5 1.1 Product Information ............................................................................................................................................. 5 1.2 Test Setup Information .......................................................................................................................................... 6 1.3 Compliance Standards ........................................................................................................................................... 7 1.4 Test Facilities ........................................................................................................................................................ 7 1.5 List of Measurement Instruments .......................................................................................................................... 8 1.6 Measurement Uncertainty ..................................................................................................................................... 8 2. Summary of Test Results ............................................................................................................................................. 9 3. Antenna Requirement ............................................................................................................................................... 10 3.1 Standard and Limit.............................................................................................................................................. 10 3.2 Test Result .......................................................................................................................................................... 10 4. Conducted Emissions ................................................................................................................................................ 11 4.1 Standard and Limit.............................................................................................................................................. 11 4.2 Test Procedure.................................................................................................................................................... 11 4.3 Test Data and Results .......................................................................................................................................... 12 5. Radiated Emissions ................................................................................................................................................... 15 5.1 Standard and Limit.............................................................................................................................................. 15 5.2 Test Procedure.................................................................................................................................................... 15 5.3 Test Data and Results .......................................................................................................................................... 17 6. Band-edge Emissions(Radiated) ............................................................................................................................... 21 6.1 Standard and Limit.............................................................................................................................................. 21 6.2 Test Procedure.................................................................................................................................................... 21 6.3 Test Data and…

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