2A2J3-SR09Smart Ring

Xiamen Linktop Technology Co., Ltd. Room 501-2,502,503, North Building, Torch Hi-Tech Zone, No.56-58 Huoju Road,Xiamen,Fujian,China 48_[model] US_Agent_2.911(d)(7) - U, V05 Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 {Sep. 07, 2023} U.S. Agent Designation {Xiamen Linktop 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: 2A2J3-SR09): Name and company of U.S. agent: Nexvoo, Inc. Physical U.S. address of agent: 1702 W Michigan St Indianapolis, IN 46222 USA FRN of U.S. agent: 0029792173 Email address of U.S. agent: [email protected] {Nexvoo, Inc.} acknowledges their obligation to accept service of process on behalf of {Xiamen Linktop Technology Co., Ltd.}. {Xiamen Linktop Technology Co., Ltd.} with the FRN [0031130610] accepts its obligation to maintain an agent for service of process in the United States for no less than 3 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, Signature {Mr Rongfeng Fan} {Engineer} {Xiamen Linktop Technology Co., Ltd.} Signature {Sophia zhang} {Manager} {Nexvoo, Inc.}

Sincerely, Name/Title： Rongfeng Fan/Electrical Engineer Company: Xiamen Linktop Technology Co., Ltd. Address: Room 501-2,502,503, North Building, Torch Hi-Tech Zone, No.56-58 Huoju Road,Xiamen,China Phone: 86-13860464623 Fax: 86-592-3691680 E-Mail: [email protected]

FCC ID:2A2J3-SR09 FCC ID:2A2J3-SR09 FCC ID:2A2J3-SR09 FCC ID:2A2J3-SR09

FCC ID:2A2J3-SR09 FCC ID:2A2J3-SR09 BT ANT

Page 1 of 2 RF EXPOSURE EVALUATION FCC ID:2A2J3-SR09 Product Name : Smart Ring Model Name : SR09W US9, SR09W, SR06, SR06W, SR03, SR09N,SR09N US6,SR09N US7,SR09N US8,SR09N US9,SR09N US10,SR09N US11,SR09N US12,SR09N US13,SR09 US6, SR09 US7, SR09 US8, SR09 US9, SR09 US10, SR09 US11, SR09 US12, SR09 US13, SR09W US6, SR09W US7, SR09W US8, SR09W US9, SR09W US10, SR09W US11, SR09W US12, SR09W US13 Bluetooth Version : BT BLE Operating frequency : 2402-2480MHz Numbers of Channel : 40 channels For DTS Antenna Type : PCB Antenna Antenna Gain : 0.95 dBi Type of Modulation : GFSK Power supply : Input:5V,1A Hardware Version : N/A Software Version : V1.0.0 Page 2 of 2 Standard Requirement According to § 15.247(i) and § 1.1307b(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy levels in excess of the Commission’s guidelines. See KDB 447498 D01 General RF Exposure Guidance v06, section 4. 3. 1. The 1-g and 10-g SAR test exclusion thresholds for 100MHz to 6GHz at test separation distances ≤ 50mm are determined by: [ (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 SAR 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. The test exclusions are applicable only when the minimum test separation distance is ≤ 50mm and for transmission frequencies between 100MHz and 6GHz. When the minimum test separation distance is <5mm, a distance of 5mm is applied to determine SAR test exclusion. Routine SAR evaluation refers to that specifically required by § 2.1093, using measurements or computer simulation. When routine SAR evaluation is not required, portable transmitters with output power greater than the applicable low threshold require SAR evaluation to quality for TCB approval. Channel (MHz) Maximum output power (dBm) Tune up tolerance (dBm) Max Tune Up Power (mW) Distance (mm) Calculation results Limit Operating Mode 2480 1.34 1.34 ± 1 1.713957 5 0.539829 3 BLE According to KDB 447498, no stand-alone required for BT antenna, and no simultaneous SAR measurement is required. Signature Simon Pu Manager Date: 2023-09-07

PCB antenna specification 1. Product model PCB antenna 2. Features *Stable and reliable in performances *Low temperature coefficient of frequency *Low profile, compact size *RoHS compliance 3.Applications *Bluetooth earphone systems *Hand-held devices when Bluetooth functions are needed, e.g., Smart phone. 4. Description The antenna are specially designed for Bluetooth applications. Based on proprietary design and processes,this antenna has excellent stability and sensitivity to consistently provide high signal reception efficiency 5. Electrical Specifications 5-1 Characteristics Specifications Unit Outline Dimensions 5.6×8.5 mm Working Frequency 2442 MHz Bandwidth (under -10dB return loss) 100min MHz VSWR 2MAX. Impedance 50 Ω Polarization Linear Polarization Gain** Peak 0.95（typical） dBi Efficiency 84（typical） % Temperature Coefficient of Frequency 0±20max（@-40°C~85°C） ppm/°C ** Working frequency will be offset to another frequency according to the conditions of users ground plane and radome. **The data was measured by A Test Lab Techno Corp.(CTIA Authorized Test Lab). 5-2 6. Antenna Dimensions(unit:mm) a.AntennaDimensions 7.Radiation Pattern 7-1.3D Gain Pattern at（2442MHz） 7-2. Efficiency Table Frequency(MHz) 2400 2410 2420 2430 2442 2450 2460 2470 2480 2490 2500 Efficiency（dB） -1.38 -1.04 -0.85 -0.74 -0.73 -0.76 -0.86 -1.05 -1.18 -1.27 -1.40 Efficiency（%） 72.83 78.71 82.27 84.39 84.53 84.04 82.00 78.60 76.14 74.64 72.50 Gain（dBi） 0.55 0.6 0.71 0.82 0.95 0.95 0.8 0.69 0.65 0.63 0.59 7-3.Efficiency vs.Frequency 8. Matching circuit: 9. Fine tuning element vs. Center frequency System Matching Circuit Component Location Description Vendor 1 N/A - 2 2.2uH (0402) 3 0.7PF 0402 10.Storage Conditions: 1) Temperature:-25 to 85 (2) Relative Humidity:20% to 70%

Page 1 of 54 FCC TEST REPORT FCC ID:2A2J3-SR09 Product : Smart Ring Model Name : SR09W US9, SR09W, SR06, SR06W, SR03, SR09N,SR09N US6,SR09N US7,SR09N US8,SR09N US9,SR09N US10,SR09N US11,SR09N US12,SR09N US13,SR09 US6, SR09 US7, SR09 US8, SR09 US9, SR09 US10, SR09 US11, SR09 US12, SR09 US13, SR09W US6, SR09W US7, SR09W US8, SR09W US9, SR09W US10, SR09W US11, SR09W US12, SR09W US13 Brand : N/A Report No. : PTC23080814801E-FC01 Prepared for Xiamen Linktop Technology Co., Ltd. Room 501-2,502,503, North Building, Torch Hi-Tech Zone, No.56-58 Huoju Road,Xiamen,Fujian,China Prepared by Precise Testing & Certification Co., Ltd Building 1, No. 6, Tongxin Road, Dongcheng Street, Dongguan, Guangdong, China Report No.: PTC23080814801E-FC01 Page 2 of 54 1 TEST RESULT CERTIFICATION Applicant’s name : Xiamen Linktop Technology Co., Ltd. Address : Room 501-2,502,503, North Building, Torch Hi-Tech Zone, No.56-58 Huoju Road,Xiamen,Fujian,China Manufacture's name : Xiamen Linktop Technology Co., Ltd. Address : Room 501-2,502,503, North Building, Torch Hi-Tech Zone, No.56-58 Huoju Road,Xiamen,Fujian,China Product name : Smart Ring Model name : SR09W US9, SR09W, SR06, SR06W, SR03, SR09N,SR09N US6,SR09N US7,SR09N US8,SR09N US9,SR09N US10,SR09N US11,SR09N US12,SR09N US13,SR09 US6, SR09 US7, SR09 US8, SR09 US9, SR09 US10, SR09 US11, SR09 US12, SR09 US13, SR09W US6, SR09W US7, SR09W US8, SR09W US9, SR09W US10, SR09W US11, SR09W US12, SR09W US13 Standards : FCC CFR47 Part 15 Section 15.247 Test procedure : ANSI C63.10:2013 Test Date : Aug. 23, 2023 to Sep. 07, 2023 Date of Issue : Sep. 07, 2023 This device described above has been tested by PTC, and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of PTC, this document may be altered or revised by PTC, personal only, and shall be noted in the revision of the document. Test Engineer: Jack zhou / Engineer Technical Manager: Simon Pu / Manager Report No.: PTC23080814801E-FC01 Page 3 of 54 Contents Page 1 TEST RESULT CERTIFICATION ........................................................................................................................ 2 2 TEST SUMMARY ......................................................................................................................................................... 5 2.1 TEST SITE ........................................................................................................................................................... 6 3 GENERAL INFORMATION ..................................................................................................................................... 7 3.1 GENERAL DESCRIPTION OF E.U.T. ................................................................................................................... 7 3.2 CHANNEL LIST .................................................................................................................................................... 8 4 EQUIPMENT DURING TEST .................................................................................................................................. 9 4.1 EQUIPMENTS LIST ............................................................................................................................................ 9 4.2 MEASUREMENT UNCERTAINTY ........................................................................................................................ 11 4.3 DESCRIPTION OF SUPPORT UNITS ................................................................................................................... 12 5 CONDUCTED EMISSION ......................................................................................................................................... 13 5.1 E.U.T. OPERATION .......................................................................................................................................... 13 5.2 EUT SETUP ...................................................................................................................................................... 13 5.3 TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) ................................................................................ 14 5.4 MEASUREMENT PROCEDURE ........................................................................................................................... 14 5.5 CONDUCTED EMISSION LIMIT ........................................................................................................................... 14 5.6 MEASUREMENT DESCRIPTION ......................................................................................................................... 14 5.7 CONDUCTED EMISSION TEST RESULT ............................................................................................................. 14 6 RADIATED SPURIOUS EMISSIONS ..................................................................................................................... 17 6.1 EUT OPERATION .............................................................................................................................................. 17 6.2 TEST SETUP ..................................................................................................................................................... 18 6.3 SPECTRUM ANALYZER SETUP ......................................................................................................................... 19 6.4 TEST PROCEDURE ............................................................................................................................................ 20 6.5 SUMMARY OF TEST RESULTS .......................................................................................................................... 22 7 CONDUCT BAND EDGE AND SPURIOUS EMISSIONS MEASURE…

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FCC ID: 2A2J3-SR09 Conducted Emissions Radiated Spurious Emissions Test Frequency From Below 30MHz FCC ID: 2A2J3-SR09 Test frequency from Above 1GHz