2BBW8-IKFT1Wireless Headphone

Dongguan Oumu Technology Co., Ltd. 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. Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 7/18/2023 To whom it may concern: We, Dongguan Oumu Technology Co., Ltd. hereby certify that the equipment for which authorization is sought (FCC ID: 2BBW8-IKFT1) 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). Sincerely, Signature Changzhen Ouyang Cross Border Supervisor Dongguan Oumu Technology Co., Ltd. 62_[model] CoveredEqu_2.911(d)(5)(i) and (ii) - U, V02

FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Appendix III EUT External Photographs Photo 1 Appearance of EUT Photo 2 Appearance of EUT

FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Appendix IID Label Size for the label: 30mm X 30mm Appendix II ID Label Location Wireless Headphone FCC ID: 2BBW8-IKFT1 Model: iKF T1 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference. 2. This device must accept any interference received, including interference that may cause undesired operation.

FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Appendix IV EUT Internal Photographs Photo 3 Internal of EUT Photo 4 Internal of EUT FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Photo 5 Appearance of PCB Photo 6 Appearance of PCB FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Photo 7 Appearance of PCB Photo 8 Battery parameters Antenna

Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202306-0300-1 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 RF Exposure Evaluation FCC ID: 2BBW8-IKFT1 1. Client Information Applicant : Dongguan Oumu Technology Co., Ltd. Address : Room 318, Building 4, No. 86, Hongtu Road, Nancheng Street, Dongguan City, Guangdong Province, China Manufacturer : Dongguan Oumu Technology Co., Ltd. Address : Room 318, Building 4, No. 86, Hongtu Road, Nancheng Street, Dongguan City, Guangdong Province, China 2. General Description of EUT EUT Name : Wireless Headphone Model(s) No. : iKF T1, iKF T1 Pro Model Different : All these models are identical in the same PCB, layout and electrical circuit, the only difference is appearance. Sample ID : 202306-0300-1-1# & 202306-0300-1-2# Product Description : Operation Frequency: Bluetooth V5.3(BDR+EDR): 2402MHz~2480MHz Bluetooth 5.3(BLE): 2402MHz~2480MHz Number of Channel: Bluetooth V5.3: 79 channels Bluetooth 5.3(BLE): 40 channels Antenna Gain: 1.9dBi PCB Antenna Power Supply : Input: DC 5V Li-ion Polymer Battery : DC 3.7V by 400mAh Rechargeable Li-ion battery Software Version : V134 Hardware Version : V1.2 Remark: The antenna gain provided by the applicant, the adapter and verified for the RF conduction test and adapter provided by TOBY test lab. Note: More test information about the EUT please refer the RF Test Report. Report No.: TBR-C-202306-0300-1 Page: 2 of 3 TB-RF-074-1.0 The RF Exposure Evaluation for FCC: SAR Test Exclusion Calculations FCC: According to 447498 D04 Interim General RF Exposure Guidance v01. The SAR-based exemption formula of § 1.1307(b)(3)(i)(B), repeated here as Formula (B.2), applies for single fixed, mobile, and portable RF sources with available maximum time-averaged power or effective radiated power (ERP), whichever is greater, of less than or equal to the threshold P th (mW). This method shall only be used at separation distances from 0.5 cm to 40 cm and at frequencies from 0.3 GHz to 6 GHz (inclusive). P th is given by Formula (B.2). and f is in GHz, d is the separation distance (cm), and ERP 20cm is per Formula (B.1). The example values shown in Table B.2 are for illustration only. Table B.2—Example Power Thresholds (mW) Report No.: TBR-C-202306-0300-1 Page: 3 of 3 TB-RF-074-1.0 Calculation: Test separation: 5mm Bluetooth Mode (GFSK) Frequency (GHz) Conducted Power (dBm) Turn-up Power Tolerance (dB) Max power of tune up tolerance (dBm) Max power of tune up tolerance (mW) Limit P th (mW) 2.402 3.026 3±1 4 2.512 3 2.441 2.937 2±1 3 1.995 3 2.480 2.532 2±1 3 1.995 3 Bluetooth Mode (π/4-DQPSK) Frequency (GHz) Conducted Power (dBm) Turn-up Power Tolerance (dB) Max power of tune up tolerance (dBm) Max power of tune up tolerance (mw) Limit P th (mW) 2.402 3.920 3±1 4 2.512 3 2.441 3.744 3±1 4 2.512 3 2.480 3.337 3±1 4 2.512 3 Bluetooth Mode (8-DPSK) Frequency (GHz) Conducted Power (dBm) Turn-up Power Tolerance (dB) Max power of tune up tolerance (dBm) Max power of tune up tolerance (mw) Limit P th (mW) 2.402 4.377 3.5±1 4.5 2.818 3 2.441 4.288 3.5±1 4.5 2.818 3 2.480 3.869 3±1 4 2.512 3 BLE (1Mbps) Frequency (GHz) Conducted Power (dBm) Turn-up Power Tolerance (dB) Max power of tune up tolerance (dBm) Max power of tune up tolerance (mw) Limit P th (mW) 2.402 2.721 2±1 3 1.995 3 2.440 2.516 2±1 3 1.995 3 2.480 2.071 2±1 3 1.995 3 BLE (2Mbps) Frequency (GHz) Conducted Power (dBm) Turn-up Power Tolerance (dB) Max power of tune up tolerance (dBm) Max power of tune up tolerance (mw) Limit P th (mW) 2.402 2.949 2±1 3 1.995 3 2.440 2.813 2±1 3 1.995 3 2.480 2.38 2±1 3 1.995 3 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 D04, No SAR is required. -----END OF THE 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-202306-0300-33 Page: 1 of 39 FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 RF Test Data for Bluetooth LE (Conducted Measurements) General Description of EUT Product Name: Wireless Headphone Test Model: iKF T1 Sample ID: 202306-0300-1-2# Environmental Conditions Temperature: 25°C Relative Humidity: 55% Test Voltage: DC 3.7V Test Engineer: Liu Ji Ming Note: For a more detailed features description, please refer to the report TBR-C-202306-0300-33 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-202306-0300-33 Page: 2 of 39 FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Contents 1. Duty Cycle ........................................................................................................................................................................................... 3 2. Maximum Conducted Output Power ................................................................................................................................................. 7 3. -6dB Bandwidth ................................................................................................................................................................................ 11 4. Occupied Channel Bandwidth ......................................................................................................................................................... 15 5. Maximum Power Spectral Density Level ......................................................................................................................................... 19 6. Band Edge ........................................................................................................................................................................................ 23 7. Conducted RF Spurious Emission .................................................................................................................................................. 28 8. Restrict Band .................................................................................................................................................................................... 35 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-202306-0300-33 Page: 3 of 39 FCC ID: 2BBW8-IKFT1 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 85.2 0.7 0.47 NVNT BLE 1Mbps 2440 Ant1 85.2 0.7 0.47 NVNT BLE 1Mbps 2480 Ant1 85.2 0.7 0.47 NVNT BLE 2Mbps 2402 Ant1 43.6 3.61 0.92 NVNT BLE 2Mbps 2440 Ant1 43.2 3.65 0.93 NVNT BLE 2Mbps 2480 Ant1 43.2 3.65 0.93 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-202306-0300-33 Page: 4 of 39 FCC ID: 2BBW8-IKFT1 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-202306-0300-33 Page: 5 of 39 FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Duty Cycle NVNT BLE 1Mbps 2480MHz Ant1 Duty Cycle NVNT BLE 2Mbps 2402MHz 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-202306-0300-33 Page: 6 of 39 FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Duty Cycle NVNT BLE 2Mbps 2440MHz Ant1 Duty Cycle NVNT BLE 2Mbps 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-202306-0300-33 Page: 7 of 39 FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 2. Maximum Conducted Output Power Condition Mode Frequency (MHz) Antenna Conducted Power (dBm) Limit (dBm) Verdict NVNT BLE 1Mbps 2402 Ant1 2.721 30 Pass NVNT BLE 1Mbps 2440 Ant1 2.516 30 Pass NVNT BLE 1Mbps 2480 Ant1 2.071 30 Pass NVNT BLE 2Mbps 2402 Ant1 2.949 30 Pass NVNT BLE 2Mbps 2440 Ant1 2.813 30 Pass NVNT BLE 2Mbps 2480 Ant1 2.380 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-202306-0300-33 Page: 8 of 39 FCC ID: 2BBW8-IKFT1 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-202306-0300-33 Page: 9 of 39 FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Power NVNT BLE 1Mbps 2480MHz Ant1 Power NVNT BLE 2Mbps 2402MHz 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-202306-0300-33 Page: 10 of 39 FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Power NVNT BLE 2Mbps 2440MHz Ant1 Power NVNT BLE 2Mbps 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-202306-0300-33 Page: 11 of 39 FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 3. -6dB Bandwidth Condition Mode Frequency (MHz) Antenna -6 dB Bandwidth (MHz) Limit -6 dB Bandwidth (MHz) Verdict …

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Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202306-0300-33 Page: 1 of 37 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 RF Test Report FCC ID: 2BBW8-IKFT1 Report No. : TBR-C-202306-0300-33 Applicant : Dongguan Oumu Technology Co., Ltd. Equipment Under Test (EUT) EUT Name : Wireless Headphone Model No. : iKF T1 Series Model No. : iKF T1 Pro Brand Name : iKF Sample ID : 202306-0300-1-1# & 202306-0300-1-2# Receipt Date : 2023-07-03 Test Date : 2023-07-03 to 2023-07-11 Issue Date : 2023-07-14 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. Witness Engineer : Wade. Lv Engineer Supervisor : Ivan Su Engineer Manager : Ray Lai 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-202306-0300-33 Page: 2 of 37 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 ...................................... 7 1.4 Description of Support Units .............................................................................................. 8 1.5 Description of Test Mode .................................................................................................... 8 1.6 Description of Test Software Setting ................................................................................ 9 1.7 Measurement Uncertainty .................................................................................................. 9 1.8 Test Facility ......................................................................................................................... 10 2. TEST SUMMARY ..................................................................................................................... 11 3. TEST SOFTWARE ................................................................................................................... 11 4. TEST EQUIPMENT .................................................................................................................. 12 5. CONDUCTED EMISSION ....................................................................................................... 14 5.1 Test Standard and Limit .................................................................................................... 14 5.2 Test Setup ........................................................................................................................... 14 5.3 Test Procedure ................................................................................................................... 14 5.4 Deviation From Test Standard ......................................................................................... 15 5.5 EUT Operating Mode ........................................................................................................ 15 5.6 Test Data ............................................................................................................................. 15 6. RADIATED AND CONDUCTED UNWANTED EMISSIONS ............................................ 16 6.1 Test Standard and Limit .................................................................................................... 16 6.2 Test Setup ........................................................................................................................... 17 6.3 Test Procedure ................................................................................................................... 18 6.4 Deviation From Test Standard ......................................................................................... 19 6.5 EUT Operating Mode ........................................................................................................ 19 6.6 Test Data ............................................................................................................................. 19 7. RESTRICTED BANDS REQUIREMENT ............................................................................. 20 7.1 Test Standard and Limit .................................................................................................... 20 7.2 Test Setup ........................................................................................................................... 20 7.3 Test Procedure ................................................................................................................... 21 7.4 Deviation From Test Standard ......................................................................................... 22 7.5 EUT Operating Mode ........................................................................................................ 22 7.6 Test Data ............................................................................................................................. 22 8. BANDWIDTH TEST ................................................................................................................. 23 8.1 Test Standard and Limit .......................................................................................…

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version01 Dongguan Oumu Technology Co., Ltd. Declaration concerning Antenna Specification It is hereby declared that the product Model No.: iKF T1, iKF T1 Pro FCC ID: 2BBW8-IKFT1 fulfills the requirement in FCC test relating to the antenna type. The device specified above confirms to the FCC recommendations for PCB antenna type(s) described below: Antenna No. Model No. of antenna: Type of antenna: Gain of the antenna (Max.) Frequency range: Bluetooth / PCB Antenna 1.9dBi for 2402-2480MHz; The mounting of the antenna is fixed to the radio module and no other antenna should be used. Company name: Dongguan Oumu Technology Co., Ltd. Address: Room 318, Building 4, No. 86, Hongtu Road, Nancheng Street, Dongguan City, Guangdong Province, China Place: Changzhen Ouyang Date: 2023-7-14 Signature:

Product specification Quick Reference Date Antenna module on the system board Frequenc Range 2402 ~ 24888888 0MHz Ant. Port Input Pwr. (dBm) 0 (Typ. BT class 2 output power) Tot. Rad. Pwr. (dBm) -1.2 (Input pwr – loss pwr) Peak EIRP(d Bm) 1.2 Directivity (dBi) 1 (all direction antenna) Efficiency (dB) 6 0.2 % Gain (dBi) 1.9 Maximum Power (dBm) 1.7 (XY-plane) Minimum Power (dBm) -4(XY-plane) Avg. Power (dBm) -0.5(XY-plane) Input Impendence(ohm) 50 Polarization Type V ertical & Horizontal V . S .W . R < 1.4 All the technical data and information contained herein are subject to change without prior notice Antenna Layout & module on the system board Antenna Gain Gain Table Unit in dBi @2.44GHz XY-plane XZ-plane YZ-plane Efficiency Peak Avg. Peak Avg. Peak Avg. Module Board 1.2 -0.51.9 -3.61.1 -3.06 0.2 % Retum Loss The Environment of Antenna Radiation Pattem 3D radiation pattern diagram XY-plane XZ-plane YZ-plane

FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Appendix V EUT Test Photographs Photo of Setup for Radiated Emission (Below 1 GHz) Photo of Setup for Radiated Emission (Above 1 GHz) FCC ID: 2BBW8-IKFT1 TB-RF-074-1.0 Photo of Setup for Radiated Emission (Above 1 GHz) Photo of Setup for Conducted Emission -----END OF THE REPORT-----