2BXU4-FLUXKIT-IMUFluxKit-IMU

02 Preface Riding Safety and Precautions Safety Warning About the Components Installation Install the Motor Install the Battery Holder Install the Controller Install the OSD Install the Battery Wiring Connection Install the IMU Motion Sensor 3 5 7-9 9 9 10 10 10-11 12 12-13 13 13-14 14 15 11 5-6 7-11 4 Contents 14 14 Bluetooth Pairing Motor Calibration Download and install the HF Bikes App Bind the Device Usage Steps Maintenance Additional Notes Component Parameters 03 Preface Dear User, First of all, we sincerely thank you for choosing the HyperFox bicycle assist system. We hereby promise to provide you with excellent quality assurance and professional after-sales service, and will continue to enrich our product line to bring you the endless joy of leisure and sports cycling. For your safety and benefit, please read this manual carefully before using the HyperFox bicycle. assist system. We shall not be liable for any personal injury, property damage or other losses caused by improper operation not in accordance with the requirements specified in this manual. ★ The copyright of this manual belongs to Nimbus Core Co., Ltd. ★ The illustrations in this manual are only for explaining the operation method or structure of the same product. In case of any discrepancy with the actual product, the actual product shall prevail. ★ This manual is only a general product description; please refer to the actual product for details. ★ Nimbus Core Co., Ltd. reserves the right to interpret and revise this manual. Thank you very much! Hong Kong Nimbus Core Limited. 04 Purpose of Riding Safety Different types of bicycles have different functions, performance, purposes and operating points, and there are different safety factors during riding. However, no matter which model you ride, for your personal safety, please always adhere to the principle of safety first. Riding Safety Instructions ☆ Please abide by the traffic regulations of the country or region where you are. ☆ Stay focused, watch out for pedestrians and vehicles, and give way appropriately. ☆ Do not ride with both hands off the handlebars, do not speed, and avoid dangerous behavior. ☆ Do not hold onto other motor vehicles or non-motor vehicles while riding. ☆ Do not touch any other objects on the road with your feet while riding. ☆ It is recommended not to drive at high speed. The riding speed should generally not exceed 25 km/h. When driving at high speed, braking should be done with intermittent application of the brakes. Avoid sudden braking at all costs. ☆ Do not wear headphones or use a mobile phone while riding. ☆ Do not park or stand and rest randomly in the middle of the non-motorized vehicle lanes; it is recommended not to ride on the motorized vehicle roads. ☆ At night, even with streetlights, the light intensity is less than 1/10 of daytime. Please reduce speed and ride carefully. ☆ Do not ride against the direction of traffic. ☆ Follow traffic lights or signs when riding, turning and parking. ☆ Mountain biking and long-distance road trips involve risks and uncertainties; riders need to have a high level of concentration and more professional cycling skills. ☆ It is recommended not to ride alone in remote areas. If unavoidable, prepare complete communication tools, carry sufficient repair tools, spare parts, identification, cash, etc. ☆ When riding outdoors, stay away from all animals and watch for pedestrians. Wear proper safety gear. When riding in the rain, fasten your rain poncho tightly to prevent it from being caught in the wheels or by passing vehicles. Braking performance decreases in wet conditions, so brake earlier. ☆ When braking, use the rear brake first or both brakes together. Braking the front wheel first may lead to serious consequences. The left brake lever controls the rear wheel; the right lever controls the front wheel. Safety Tips During Cycling For your safety, you must wear a helmet, gloves and other necessary safety equipment. Always pay attention to traffic safety to avoid danger. Watch for vehicles, pedestrians, road conditions and weather. If any abnormality is found during riding, stop and check immediately. Maintain and inspect your bicycle promptly after riding. If problems occur during riding, have them repaired by professionals as soon as possible. HyperFox FluxKit eBike Power Assist System Kit User Guide Riding Safety and Precautions 05 Safety Warning To ensure safe use of the FluxKit bicycle assist system kit, please follow these guidelines: 1.Charge the battery fully before the first use. Before installing the kit, make sure the battery is fully charged (When charged until the power indicator light goes out). 2.Do not charge the battery unattended. Avoid charging longer than necessary. Overcharging will shorten battery life. 3.When the battery power cable is connected to the controller's power input interface, make sure the waterproof plug of the battery power cable is properly connected and fully plugged in, and ensure the battery is installed correctly. 4.Before riding, make sure all components are securely fastened, all connection cables are properly connected and tightened, and there is no looseness. Before riding, make sure all nuts, screws and bolts are tightened. Any loose components may cause damage to the motor during riding. Check and tighten the spokes once every 100 kilometers to ensure the hub is firmly fixed. About the Components Smart Battery Motor 1.Torque washer 2.Washer 3.Spring washer 4.Fixed axle 5.Lock nut 6.Connecting cable (to controller) 7.Alignment mark HyperFox FluxKit eBike Power Assist System Kit User Guide 2 3 1 6 7 5 4 1.Battery Mounting Bracket 2.Power Button: Long press for 3 seconds time - to turn on/off the device. 3.Indicator Lights: Red solid light — Battery ≤ 10%, Yellow solid light — 10% ＜ Battery ＜ 50%, Green solid light — Battery ＞ 50%, Red flashing light (charging) — Battery ≤ 10%, Yellow flashing light (charging) — 10% ＜ Battery ＜ 50%, Green flashing light (ch…

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Rev 1/26/2023 Guangzhou Feiyun UAV information technology co., ltd Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 09-01-2026 Ref: Attestation Statements Part 2.911(d)(5)(i) Filing FCC ID: 2BXU4-FLUXKIT-IMU [Guangzhou Feiyun UAV information 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. [Guangzhou Feiyun UAV information technology co., ltd] certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24- 886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Device is inherently compliant based on hardware limitations or software controls. or A Software Bill of Materials (SBOM) is provided to the TCB for review, and The end-user or third parties cannot install additional software on this device. Sincerely, (Applicant signature) (Applicant printed name) Nini Rev 1/26/2023 Guangzhou Feiyun UAV information technology co., ltd Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 09-01-2026 Ref: Attestation Statements Part 2.911(d)(5)(ii) Filing FCC ID: 2BXU4-FLUXKIT-IMU [Guangzhou Feiyun UAV information technology co., ltd] ce8rtifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) Nini

Guangzhou Feiyun UAV information technology co., ltd U.S. Agent Letter of Attestation To: Federal Communications Commission 7435 Oakland Mills Road, Columbia, MD 21046, USA Date: September 1, 2026 Ref: Attestation Statement – Part 2.911(d)(7) filing FCC ID: 2BXU4-FLUXKIT-IMU Guangzhou Feiyun UAV information technology co., ltd (“the applicant”) certifies that, as of the date of the filing of the application, GLOBAL PRODUCT PROMOTION COMMERCE CO., LTD. (“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. GLOBAL PRODUCT PROMOTION COMMERCE CO., LTD. ("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: GLOBAL PRODUCT PROMOTION COMMERCE CO., LTD. FRN: 0037700671 Address: 350 NORTHERN BLVD STE 324-1331, ALBANY, NY, 12204, USA Signature: Contact Person: David Kim Tel: (213)849-1481 Email: [email protected] Applicant Company Name: Guangzhou Feiyun UAV information technology co., ltd FRN: 0038816328 Address: Room 205, Building 9, Standard Industrial Park, Dongchong Town, Nansha District, Guangzhou, China Signature: Contact Person: Nini Tel: +86-18165705173 Email: [email protected]

Guangzhou Feiyun UAV information technology co., ltd Date: September 1, 2026 Product Model Number: FluxKit-IMU FCC ID: 2BXU4-FLUXKIT-IMU 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: Nini Contact Listed on FCC Wesbite Title: Manager Email: [email protected] Telephone: +86-18165705173 On behalf of: Guangzhou Feiyun UAV information technology co., ltd

Guangzhou Feiyun UAV information technology co., ltd Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: September 1, 2026 Subject; Request for Confidentiality FCC ID: 2BXU4-FLUXKIT-IMU 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 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: Nini Title: Manager

Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report Annex A. EUT External Photos Model: FluxKit-IMU EUT View 1 EUT View 2 Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report EUT View 3 EUT View 4 Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report EUT View 5 EUT View 6 Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report EUT View 7

Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report Annex D. Label and Inf ormation FCC Label Sample FCC Labe Size: 36mm *4mm 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

Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report Annex B. EUT Internal Photos Model: FluxKit-IMU EUT Internal View 1 EUT Internal View 2 Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report EUT Internal View 3 EUT Internal View 4 PCB ANT Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report EUT Internal View 5

FCC ID: 2BXU4-FLUXKIT-IMU 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 BLE_1Mbps Max Conducted Power(dBm) Tune-up Power(dBm) Max Tune-up Power(dBm) Max Power(mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit 2.82 2(±1) 3 1.995 2402 5 0.61839 3.0 So a SAR test is not required

Page 1 of 3 1. General Inf ormation 1.1 Antenna Information Manufacturer: Guangzhou Feiyun UAV information technology co., ltd Address of Manufacturer: Room 205, Building 9, Standard Industrial Park, Dongchong Town, Nansha District, Guangzhou, China Product Name: 2.4GHz Antenna Model Name: FluxKit-IMU Frequency Range: 2402MHz - 2480MHz Type of Antenna: PCB Antenna Antenna Gain: 0dBi (Max.) Impedance: 50 ohm Antenna View: Length * Width (6mm * 2mm) Page 2 of 3 2. Antenna Specification inf ormation 2.1 Gain Frequency Peak Gain (dBi) Polarity 2402MHz 0 Horizontal 2402MHz -0.89 Vertical 2440MHz -1.71 Horizontal 2440MHz -1.83 Vertical 2480MHz -1.98 Horizontal 2480MHz -2.09 Vertical Page 3 of 3 2.2 Radiation Pattern View

Report No: SSP26080153-1 FCC Test Report Page 1 of 33 FCC TEST REPORT FCC ID: 2BXU4-FLUXKIT-IMU Report No. : SSP26080153-1 Applicant : Guangzhou Feiyun UAV information technology co., ltd Product Name : FluxKit-IMU Model Name : FluxKit-IMU Test Standard : FCC Part 15.247 Date of Issue : 2026-08-24 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.zrlklab.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. Report No: SSP26080153-1 FCC Test Report Page 2 of 33 Test Report Basic Information Applicant..................................: Guangzhou Feiyun UAV information technology co., ltd Address of Applicant...............: Room 205, Building 9, Standard Industrial Park, Dongchong Town, Nansha District, Guangzhou, China Manufacturer..........................: Guangzhou Feiyun UAV information technology co., ltd Address of Manufacturer........: Room 205, Building 9, Standard Industrial Park, Dongchong Town, Nansha District, Guangzhou, China Product Name.........................: FluxKit-IMU Brand Name.............................: HyperFox Main Model..............................: FluxKit-IMU Series Models..........................: - Test Standard..........................: FCC Part 15 Subpart C KDB 558074 D01 15.247 Meas Guidance v05r02 ANSI C63.4-2014 ANSI C63.10-2020 + Cor. 1-2023+C63.10a-2024 + Errata to C63.10a-2024 Date of Test .............................: 2026-08-13 to 2026-08-21 Test Result...............................: PASS Tested By ................................: (Walker Wu) Reviewed By............................: (Lorzix Luo) 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. Report No: SSP26080153-1 FCC Test Report Page 3 of 33 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 .....................................................................................................................................9 2. Summary of Test Results ........................................................................................................................................... 10 3. Antenna Requirement ............................................................................................................................................... 11 3.1 Standard and Limit.............................................................................................................................................. 11 3.2 Test Result .......................................................................................................................................................... 11 4. Conducted Emissions ................................................................................................................................................ 12 4.1 Standard and Limit.............................................................................................................................................. 12 4.2 Test Procedure.................................................................................................................................................... 12 4.3 Test Data and Results .......................................................................................................................................... 13 5. Radiated Emissions ................................................................................................................................................... 16 5.1 Standard and Limit.............................................................................................................................................. 16 5.2 Test Procedure.................................................................................................................................................... 16 5.3 Test Data and Results .......................................................................................................................................... 18 6. Band-edge Emissions(Radiated) ............................................................................................................................... 22 6.1 Standard and Limit.............................................................................................................................................. 22 6.2 Test Procedure.................................................................................................................................................... 22 6.3 Test Data and Results ..................................…

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Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report Annex C. Test Photos Conducted Emission Test View 1 Radiated Emission Test View Below 1GHz Report No: SSP26080153-1 FCC ID: 2BXU4-FLUXKIT-IMU Annex of Test Report Radiated Emission Test View Above 1GHz