2BV24-HB135Rotatable Bluetooth Keyboard

Bluetooth Keyboard User Manual 1. Product Features • Bluetooth wireless connection + scissor-switch key structure for comfortable typing • Built-in rechargeable polymer lithium battery • Auto-sleep after 10 minutes of inactivity (low power consumption, long battery life) 2. Pairing Instructions 1. Power on the keyboard. 2. Press and hold the Connect button for 3 seconds until the blue LED flashes. 3. On your device: open Bluetooth settings → select Bluetooth Keyboard → enter pairing code (if prompted) to connect.Note: No re-pairing needed after first successful connection. 3. Hot Keys (Fn + Key) □ □ HOME Decrease the volume Search Increase the volume Mute ⌨ Virtual keyboard Prev Reduce ipad brightness F Next Increase ipad brightness F Lock Screen Backlight brightness adjustment Play/Pause Backlight color switching Bluetooth Intelligent voice Other Function Key Instructions Enable/Disable Trackpad Input method switch: Control + Space or Fn + 4. Indicator Guide • 1.Bluetooth indicator: Flashes during pairing: • 2.Caps LED: Lights up when Caps Lock is active • 3.Battery Status. 4.When charging, the bars on the display flash alternately.When fully charged, the bars stay on steadily. 5. Charging Instructions 1 1.First use: Charge for ≥6 hours. 1. 2.Low battery (%LED flashes): Charge for ≥2 hours. 2. 3.Connect USB cable to the keyboard’s charging port (as shown in diagram). 3. . 6. Troubleshooting 1. Ensure Bluetooth is enabled and device is within 10m. 2. Check pairing password (if required). 3. Charge the keyboard if battery is low. 4. If issues persist: o Delete "Bluetooth Keyboard" from your device’s Bluetooth list. o Restart keyboard and device. o Re-pair following Section 2 steps. 7. Specifications Parameter Value Frequency 2.4GHz Voltage 3.7V DC Operating Current ~12.8mA Standby Current ~7.8mA Sleep Current <0.1mA Range Up to 10 meters Safety Notes • Keep away from water, high temperatures, and strong impacts. • Avoid strong electromagnetic interference. FCC Warning 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, and (2) this device must accept any interference received, including interference that may cause undesired operation. NOTE 1: This equipment has been tested and found to 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 instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does 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. - Increase the separation between the equipment and receiver. -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. NOTE 2: Any changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Rev 1/26/2023 Dongguan Huichengsheng Electronic Technology Co., Ltd Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 08-03-2026 Ref: Attestation Statements Part 2.911(d)(5)(i) Filing FCC ID: 2BV24-HB135 [Dongguan Huichengsheng Electronic 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. [Dongguan Huichengsheng Electronic 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) He Jie Rev 1/26/2023 Dongguan Huichengsheng Electronic Technology Co., Ltd Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 08-03-2026 Ref: Attestation Statements Part 2.911(d)(5)(ii) Filing FCC ID: 2BV24-HB135 [Dongguan Huichengsheng Electronic 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) He Jie

Dongguan Huichengsheng Electronic Technology Co., Ltd U.S. Agent Letter of Attestation To: Federal Communications Commission 7435 Oakland Mills Road, Columbia, MD 21046, USA Date: August 03, 2026 Ref: Attestation Statement – Part 2.911(d)(7) filing FCC ID: 2BV24-HB135 Dongguan Huichengsheng Electronic 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: Dongguan Huichengsheng Electronic Technology Co., Ltd FRN: 0038409082 Address: 4th Floor, Building 4, Xiangfeng Building, Liaobu Town, Dongguan City, China Signature: Contact Person: He Jie Tel: 13826960826 Email: [email protected]

Dongguan Huichengsheng Electronic Technology Co., Ltd Date: August 03, 2026 Product Model Number: HB135 FCC ID: 2BV24-HB135 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: He Jie Contact Listed on FCC Wesbite Title: Manager Email: [email protected] Telephone: 13826960826 On behalf of: Dongguan Huichengsheng Electronic Technology Co., Ltd

Dongguan Huichengsheng Electronic Technology Co., Ltd Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: August 3, 2026 Subject; Request for Confidentiality FCC ID: 2BV24-HB135 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: He Jie Title: Manager

Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report Annex A. EUT External Photos Model: HB135 EUT View 1 EUT View 2 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 3 EUT View 4 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 5 EUT View 6 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 7 EUT View 8 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 9 EUT View 10 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 11 EUT View 12 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 13 EUT View 14 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 15 . EUT View 16 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 17 EUT View 18 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 19 EUT View 20 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT View 21 EUT View 22

Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report Annex D. Label and Information FCC Label Sample Label Size: 5cm * 3cm 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: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report Annex B. EUT Internal Photos Model: HB135 EUT Internal View 1 EUT Internal View 2 PCB Antenna Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT Internal View 3 EUT Internal View 4 Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report EUT Internal View 5 EUT Internal View 6

FCC ID: 2BV24-HB135 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 Max Conducted Power(dBm) Tune-up Power(dBm) Max Tune-up Power(dBm) Max Power(mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit 2.35 2(±1) 3 1.995 2402 5 0.6183 3.0 So a SAR test is not required

Page 1 of 3 1. General Information 1.1 Product Information Manufacturer: Dongguan Huichengsheng Electronic Technology Co., Ltd Address of Manufacturer: 4th Floor, Building 4, Xiangfeng Building, Liaobu Town, Dongguan City, China Product Name: 2.4G Antenna Model Name: HB135 Frequency Range: 2400MHz - 2483.5MHz Type of Antenna: PCB Antenna Antenna Gain: 0dBi (Max.) Impedance: 50 ohm Antenna View: Length * Width (1.5cm * 0.5cm) Page 2 of 3 2. OTA Test 2.1 Gain Frequency Peak Gain (dBi) Polarity 2402MHz 0 Horizontal 2402MHz -0.53 Vertical 2442MHz -1.32 Horizontal 2442MHz -1.79 Vertical 2480MHz -1.81 Horizontal 2480MHz -2.08 Vertical Page 3 of 3 2.2 Radiation Pattern View

Report No: SSP26060325-1E FCC Test Report Page 1 of 33 FCC TEST REPORT FCC ID: 2BV24-HB135 Report No. : SSP26060325-1E Applicant : Dongguan Huichengsheng Electronic Technology Co., Ltd. Product Name : Rotatable Bluetooth Keyboard Model Name : HB135 Test Standard : FCC Part 15.247 Date of Issue : 2026-07-02 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. Report No: SSP26060325-1E FCC Test Report Page 2 of 33 Test Report Basic Information Applicant..................................: Dongguan Huichengsheng Electronic Technology Co., Ltd Address of Applicant...............: 4th Floor, Building 4, Xiangfeng Building, Liaobu Town, Dongguan City, China Manufacturer..........................: Dongguan Huichengsheng Electronic Technology Co., Ltd Address of Manufacturer........: 4th Floor, Building 4, Xiangfeng Building, Liaobu Town, Dongguan City, China Product Name.........................: Rotatable Bluetooth Keyboard Brand Name.............................: - Main Model..............................: HB135 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 .............................: 2026-06-15 to 2026-06-25 Test Result...............................: PASS Tested By ................................: (Coke Huang) 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: SSP26060325-1E 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: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report Annex C. Test Photos Conducted Emission Test View 1 Radiated Emission Test View Below 1GHz Report No: SSP26060325-1E FCC ID: 2BV24-HB135 Annex of Test Report Radiated Emission Test View Above 1GHz