2A56X-FIT4-PROFit4 Pro

FCC Statement • Increase the separation between the equipment and cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: • Reorient or relocate the receiving antenna. receiver. guarantee that interference will not occur in a particular • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. The device has been evaluated to meet general RF exposure requirement. The device can be used installation. If this equipment does communications. However, there is no This device complies with part 15 of the FCC rules. void the user's authority to operate the equipment. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could NOTE: This equipment has been tested and found to instructions, may cause harmful interference to radio comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the in portable exposure condition without restriction.

FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Appendix III EUT External Photographs Photo 1 Appearance of EUT Photo 2 Appearance of EUT EUT FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Photo 3 Appearance of EUT Photo 4 Appearance of EUT FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Photo 5 Appearance of EUT

FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Appendix IID Label Appendix II ID Label Location FCC ID: 2A56X-FIT4-PRO

FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Appendix IV EUT Internal Photographs Photo 6 Internal of EUT Photo 7 Appearance of PCB Antenna FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Photo 8 Appearance of PCB Photo 9 Battery parameters

Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202509-0047-1 Page: 1 of 8 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: 2A56X-FIT4-PRO Original Grant Report No. : TBR-C-202509-0047-1 Applicant : NJY Technology Co., Limited Equipment Under Test (EUT) EUT Name : Fit4 Pro Model No. : Fit4 Pro Series Model No. : ---- Brand Name : ---- Sample ID : HC-C-202509-0047-01-1# & HC-C-202509-0047-01-2# Receipt Date : 2025-09-08 Test Date : 2025-09-08 to 2025-10-28 Issue Date : 2025-10-28 Standards : FCC Part 2.1093 Test Method : KDB 447498 D01 General RF Exposure Guidance v06 Conclusions : PASS In the configuration tested, the EUT complied with the standards specified above. Test By : Lily Zhang Reviewed By : Emily Tang 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-202509-0047-1 Page: 2 of 8 TB-RF-074-1.0 CONTENTS CONTENTS ............................................................................................................................................. 2 1. GENERAL INFORMATION ABOUT EUT.............................................................................. 4 1.1 Client Information ................................................................................................................. 4 1.2 General Description of EUT (Equipment Under Test) ................................................... 4 2. MEASUREMENT UNCERTAINTY .......................................................................................... 5 3. TEST FACILITY.......................................................................................................................... 6 4. SAR TEST EXCLUSION CALCULATIONS .......................................................................... 7 Report No.: TBR-C-202509-0047-1 Page: 3 of 8 TB-RF-074-1.0 Revision History Report No. Version Description Issued Date TBR-C-202509-0047-1 Rev.01 Initial issue of report 2025-10-28 Report No.: TBR-C-202509-0047-1 Page: 4 of 8 TB-RF-074-1.0 1. General Information about EUT 1. 1 Client Information Applicant : NJY Technology Co., Limited Address : 5 Songpingshan Road, #201 JiaDa R&D Building Lobby B Shenzhen, 518057 China Manufacturer : NJY Technology Co., Limited Address : 5 Songpingshan Road, #201 JiaDa R&D Building Lobby B Shenzhen, 518057 China 1.2 General Description of EUT (Equipment Under Test) EUT Name : Fit4 Pro Models No. : Fit4 Pro Model Different : ---- Product Description : Operation Frequency: Bluetooth V5.3: 2402MHz~2480MHz Modulation Type: Bluetooth&BLE: GFSK, Pi/4-DQPSK, 8-DPSK Antenna Gain: 2.0dBi Wire Antenna Power Rating : Input: DC 5V,100mA Li-ion Polymer Battery : 3.8V by 420mAh Rechargeable Li-ion battery Software Version : NJ-F8M-2.0.7 Hardware Version : KP09-MB-V1.0 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-202509-0047-1 Page: 5 of 8 TB-RF-074-1.0 2. 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 %. Test Item Parameters Expanded Uncertainty (U Lab ) Conducted Emission Level Accuracy: 9kHz~150kHz 150kHz to 30MHz ±3.50 dB ±3.10 dB Radiated Emission Level Accuracy: 9kHz to 30 MHz ±4.60 dB Radiated Emission Level Accuracy: 30MHz to 1000 MHz ±4.50 dB Radiated Emission Level Accuracy: Above 1000MHz ±4.20 dB RF Power-Conducted Level Accuracy: Above 1000MHz ±0.95 dB Power Spectral Density- Conducted Level Accuracy: Above 1000MHz ±3dB Occupied Bandwidth Level Accuracy: 30MHz to 1000 MHz Above 1000MHz ±3.8% Unwanted Emission- Conducted Level Accuracy: 30MHz to 1000 MHz Above 1000MHz ±2.72 dB Temperature / ±0.6°C Humidity / ±4% Supply voltages / ±2% Time / ±4% Report No.: TBR-C-202509-0047-1 Page: 6 of 8 TB-RF-074-1.0 3. Test Facility The testing report were performed by the Shenzhen Toby Technology Co., Ltd., in their facilities located at 1/F., Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. At the time of testing, the following bodies accredited the Laboratory: CNAS (L5813) The Laboratory has been accredited by CNAS to ISO/IEC 17025: 2017 General Requirements for the Competence of Testing and Calibration Laboratories for the competence in the field of testing. And the Registration No.: CNAS L5813. A2LA Certificate No.: 4750.01 The laboratory has been accredited by American Association for Laboratory Accreditation(A2LA) to ISO/IEC 17025：2017 General Requirements for the Competence of Testing and Calibration Laboratories for the technical competence in the field of Electrical Testing. And the A2LA Certificate No.: 4750.01.FCC Accredited Test Site Number: 854351. Designation Number: CN1223. IC Registration No.: (11950A) The Laboratory has been registered by Certification and Engineering Bureau of Industry Canada for radio equipment testing. The site registration: Site# 11950A. CAB identifier: CN0056. Report No.: TBR-C-202509-0047-1 Page: 7 of 8 TB-RF-074-1.0 4. SAR Test Exclusion Calculations 4.1 FCC: According to KDB 447498 D01 v06 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 dist…

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Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202509-0047-31 Page: 1 of 35 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: 2A56X-FIT4-PRO Original Grant Report No. : TBR-C-202509-0047-31 Applicant : NJY Technology Co., Limited Equipment Under Test (EUT) EUT Name : Fit4 Pro Model No. : Fit4 Pro Series Model No. : ---- Brand Name : ---- Sample ID : HC-C-202509-0047-01-1# & HC-C-202509-0047-01-2# Receipt Date : 2025-09-08 Test Date : 2025-09-08 to 2025-10-28 Issue Date : 2025-10-28 Standards : FCC Part 15 Subpart C 15.247 Test Method : ANSI C63.10: 2020 KDB 558074 D01 15.247 Meas Guidance v05r02 Conclusions : PASS In the configuration tested, the EUT complied with the standards specified above. Test By : Lily Zhang Reviewed By : Emily Tang 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-202509-0047-31 Page: 2 of 35 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 AND TEST SITE ................................................................................... 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 ......................................................................................... 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. 99% OCCUPIED AND 20DB BANDWIDTH ........................................................................ 21 8.1 Test Standard and Limit .................................................................................................... 21 8.2 Test Setup .....................................…

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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-202509-0047-31 Page: 1 of 64 FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 RF Test Data for Bluetooth (Conducted Measurements) General Description of EUT Product Name: Fit4 Pro Test Model: Fit4 Pro Sample ID: HC-C-202509-0047-01-2# Environmental Conditions Temperature: 24°C Relative Humidity: 48% Test Voltage: DC 5V Test Engineer: Lily Zhang Note: For a more detailed features description, please refer to the report TBR-C-202509-0047-31 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-202509-0047-31 Page: 2 of 64 FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Contents 1. Dwell Time........................................................................................................................................................................................... 3 2. Duty Cycle ........................................................................................................................................................................................... 8 3. Maximum Conducted Output Power ............................................................................................................................................... 14 4. -20dB Bandwidth .............................................................................................................................................................................. 20 5. Occupied Channel Bandwidth ......................................................................................................................................................... 26 6. Band Edge ........................................................................................................................................................................................ 32 7. Conducted RF Spurious Emission .................................................................................................................................................. 39 8. Restrict Band .................................................................................................................................................................................... 49 9. Band Edge(Hopping) ........................................................................................................................................................................ 56 10. Carrier Frequencies Separation ..................................................................................................................................................... 61 11. Number of Hopping Channel ......................................................................................................................................................... 63 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-202509-0047-31 Page: 3 of 64 FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 1. Dwell Time Condition Mode Frequency (MHz) Antenna Pulse Time (ms) Total Dwell Time (ms) Period Time (ms) Limit (ms) Verdict NVNT 1-DH1 2441 Ant1 0.383 122.56 31600 400 Pass NVNT 1-DH3 2441 Ant1 1.639 262.24 31600 400 Pass NVNT 2-DH1 2441 Ant1 0.392 125.44 31600 400 Pass NVNT 2-DH3 2441 Ant1 1.644 263.04 31600 400 Pass NVNT 2-DH5 2441 Ant1 2.892 308.48 31600 400 Pass NVNT 3-DH1 2441 Ant1 0.392 125.44 31600 400 Pass NVNT 3-DH3 2441 Ant1 1.643 262.88 31600 400 Pass NVNT 3-DH5 2441 Ant1 2.894 308.693 31600 400 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-202509-0047-31 Page: 4 of 64 FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Test Graphs Dwell NVNT 1-DH1 2441MHz Ant1 Dwell NVNT 1-DH3 2441MHz 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-202509-0047-31 Page: 5 of 64 FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Dwell NVNT 2-DH1 2441MHz Ant1 Dwell NVNT 2-DH3 2441MHz 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-202509-0047-31 Page: 6 of 64 FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Dwell NVNT 2-DH5 2441MHz Ant1 Dwell NVNT 3-DH1 2441MHz 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-202509-0047-31 Page: 7 of 64 FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Dwell NVNT 3-DH3 2441MHz Ant1 Dwell NVNT 3-DH5 2441MHz 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-202509-0047-31 Page: 8 of 64 FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 2. Duty Cycle Condition Mode Frequency (MHz) Antenna Duty Cycle (%) Correction Factor (dB) 1/T (kHz) NVNT 1-DH5 2402 Ant1 76.94 1.14 0.35 NVNT 1-DH5 2441 Ant1 77.01 1.13 0.35 NVNT 1-DH5 2480 Ant1 76.99 1.14 0.35 NVNT 2-DH5 2402 Ant1 77.15 1.13 0.35 NVNT 2-DH5 2441 Ant1 77.15 1.13 0.35 NVNT 2-DH5 2480 Ant1 77.15 1.13 0.35 NVNT 3-DH5 2402 Ant1 77.2 1.12 0.35 NVNT 3-DH5 2441 Ant1 77.17 1.13 0.35 NVNT 3-DH5 2480 Ant1 77.17 1.13 0.35 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-202509-0047-31 Page: 9 …

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Product specification QuickReferenceDate Antenna module on the system board Frequenc Range 2400 ~ 2500GHz Ant. Port Input Pwr.(dBm) 0 (Typ. BT class 2outputpower) Tot. Rad. Pwr.(dBm) -1.2 (Input pwr – loss pwr) Peak EIRP(dBm)1.2 Directivity (dBi) 1(alldirectionantenna) Efficiency (dB)60.2% Gain(dBi) 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 Vertical & Horizontal V.S.W. R <1.4 All the technical data and information contained herein aresubject tochange without prior notice Antenna Layout & module on thesystemboard Antenna Gain Gain Table [email protected] Efficiency Peak Avg. Peak Avg. Peak Avg. Module Board -0.51.9-3.61.1-3.060.2% 2.0 (AvgGain XY-plane) 2.0 Shenzhen Xinbino Communication Technology Co., Ltd Zone A, 3rd Floor, Building 25, Feipeng Industrial Park, No. 171 Ping'an Avenue, Pinghu Street, Longgang District, Shenzhen ReturnLoss TheEnvironmentofAntennaRadiationPattern 3Dradiationpatterndiagram

FCC ID: 2A56X-FIT4-PRO 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: 2A56X-FIT4-PRO TB-RF-074-1.0 Photo of Setup for Conducted Emission Photo of Setup for Conducted Measurement FCC ID: 2A56X-FIT4-PRO TB-RF-074-1.0 Photo of Setup for Conducted Measurement -----END OF THE REPORT-----