2BVGJ-TUNE65Mechanical Keyboard

Rev 1/26/2023 Sisun Electronics Technology (DG) CO., LTD Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2026-06-30 FCC ID: 2BVGJ-TUNE65 Ref. #1: Attestation Statements Part 2.911(d)(5)(i) Filing Sisun Electronics Technology (DG) 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. Sisun Electronics Technology (DG) 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. Ref. #2: Attestation Statements Part 2.911(d)(5)(ii) Filing Sisun Electronics Technology (DG) CO., LTD certifies 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. Applicant: Sisun Electronics Technology (DG) CO., LTD Address: Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Contact Person: Shuxin Yu Tel.: 86 18998070713 Email: [email protected] Sincerely, Signature:

Attestation Statements Date: 2026-06-30 TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA Sisun Electronics Technology (DG) CO., LTD, the undersigned, hereby authorize HOPEK CORPORATION INC to act as our designated agent for service of process, Sisun Electronics Technology (DG) CO., LTD accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission- RE: Attestation Statements Part 2.911(d)(7) request for(FCC ID:2BVGJ-TUNE65) related proceeding involving the equipment. HOPEK CORPORATION INC accepts the responsibility to act as designated agent for service of process. Applicant Information： Company name: Sisun Electronics Technology (DG) CO., LTD Contact Name: Shuxin Yu Address: Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Telephone No: 86 18998070713 Email: [email protected] FRN: 0038228979 Signature: Shuxin Yu Signat Agent Information: Company Name:HOPEK CORPORATION INC Address:16755 Coyote Bush Dr Unit 84, San Diego, CA 92127 United States FRN:0034562900 Contact Name:YangyangXu Telephone No:561-875-9826 Email:[email protected] ure: Yangyang Xu

Sisun Electronics Technology (DG) CO., LTD Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: June 30, 2026 Subject; Request for Confidentiality FCC ID: 2BVGJ-TUNE65 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 U-NII DEVICES In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. 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: Shuxin Yu Title: Sales

Effective Date: April 2, 2020 QSF 7.6.4-8 – Agent Authorization Letter Template Page 1 of 1 Revision Date: Revision: 0 Sisun Electronics Technology (DG) CO., LTD Date：2026-06-30 Product Model Number: TUNE 65, SN002 FCC ID：2BVGJ-TUNE65 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. Signature: By: Shuxin Yu Contact Listed on FCC Wesbite Title: Sales Email: [email protected] On behalf of: Sisun Electronics Technology (DG) CO., LTD

Sisun Electronics Technology (DG) CO., LTD Declaration Letter of Model Difference Date: 2026-06-30 FCC ID: 2BVGJ-TUNE65 Tested Model Number: TUNE 65 Adding Model Number(s): SN002 All Adding Model Number(s) is/are same electrically identical as Tested Model Number. The names are different. Yours Sincerely, Applicant: Sisun Electronics Technology (DG) CO., LTD Address: Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Contact Person: Shuxin Yu Tel.: 86 18998070713 Email: [email protected] Sincerely, Signature:

Page 1 of 4 Report No.: LGT26F042 Appendix - External Photographs of EUT Constructional Details Photo 1 Photo 2 Page 2 of 4 Report No.: LGT26F042 Appendix - External Photographs of EUT Constructional Details Photo 3 Photo 4 Page 3 of 4 Report No.: LGT26F042 Appendix - External Photographs of EUT Constructional Details Photo 5 Photo 6 Page 4 of 4 Report No.: LGT26F042 Appendix - External Photographs of EUT Constructional Details Photo 7 Photo 8

Label Size: 32*60mm Model Number: TUNE 65 FCC ID: 2BVGJ-TUNE65

Page 1 of 5 Report No.: LGT26F042 Appendix - Internal Photographs of EUT Constructional Details Photo 1 Photo 2 Page 2 of 5 Report No.: LGT26F042 Appendix - Internal Photographs of EUT Constructional Details Photo 3 Photo 4 Page 3 of 5 Report No.: LGT26F042 Appendix - Internal Photographs of EUT Constructional Details Photo 5 Photo 6 Page 4 of 5 Report No.: LGT26F042 Appendix - Internal Photographs of EUT Constructional Details Photo 7 Photo 8 Page 5 of 5 Report No.: LGT26F042 Appendix - Internal Photographs of EUT Constructional Details Photo 9

The test report is effective only with both signature and specialized stamp. This report shall not be reproduced except in full without the written approval of the Laboratory. The results in this report only apply to the tested sample. Shenzhen LGT Test Service Co., Ltd. Tel: 0755-89668180 E-mail:[email protected] Web: www.lgt-cert.com Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Page 1 of 8 EMF TEST REPORT Product Name: Mechanical Keyboard Model Number: TUNE 65, SN002 FCC ID: 2BVGJ-TUNE65 Issued For : Sisun Electronics Technology (DG) CO., LTD Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Issued By : Shenzhen LGT Test Service Co., Ltd. Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Report Number: LGT26F042HA02 Sample Received Date: Jun. 04, 2026 Date of Test: Jun. 04, 2026 ~ Jun. 15, 2026 Date of Issue: Jun. 15, 2026 Report No.: LGT26F042HA02 Page 2 of 8 TEST REPORT CERTIFICATION Applicant: Sisun Electronics Technology (DG) CO., LTD Address: Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Manufacturer: Sisun Electronics Technology (DG) CO., LTD Address: Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Product Name: Mechanical Keyboard Trademark: N/A Model Number: TUNE 65, SN002 Sample Status: Normal APPLICABLE STANDARDS STANDARD TEST RESULTS FCC 47 CFR §2.1093 KDB 447498 D01 General RF Exposure Guidance v06 PASS Prepared by: Approved by: Zane Shan Vita Li Engineer Technical Director Report No.: LGT26F042HA02 Page 3 of 8 TABLE OF CONTENTS 1 . GENERAL INFORMATION 5 1.1 GENERAL DESCRIPTION OF THE EUT 5 1.2 TEST LABORATORY 5 2 . FCC 47CFR §2.1093 REQUIREMENT 6 2.1 TEST STANDARDS 6 2.2 LIMIT 6 2.3 TEST RESULT 8 Report No.: LGT26F042HA02 Page 4 of 8 Revision History Rev. Issue Date Revisions 00 Jun. 15, 2026 Initial Issue Report No.: LGT26F042HA02 Page 5 of 8 1. GENERAL INFORMATION 1.1 GENERAL DESCRIPTION OF THE EUT Product Name: Mechanical Keyboard Test Model Number: TUNE 65 Series Number: SN002 Model Difference: The names are different. Frequency Bands: Bluetooth 2402-2480MHz 2.4G 2402-2480MHz Rating: Input: DC 5V 1000mA Battery: Capacity: 4000mAh Rated Voltage: 3.7V Hardware Version: N/A Software Version: 102 1.2 TEST LABORATORY Company Name: Shenzhen LGT Test Service Co., Ltd. Address: Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Accreditation Certificate: FCC Registration No.: 746540 CAB ID: CN0136 Report No.: LGT26F042HA02 Page 6 of 8 2. FCC 47CFR §2.1093 REQUIREMENT 2.1 TEST STANDARDS The limit for Maximum Permissible Exposure (MPE) specified in KDB 447498 D01 General RF Exposure Guidance v06 is followed. The gain of the antennas used in the product is extracted from the Antenna data sheets provided and also the maximum total power input to the antenna is measured. Through the Friis transmission formula and the maximum gain of the antenna, we can calculate the distance, away from the product, where the limit of MPE is reached. Although the Friis Transmission formula is far field assumption, the calculated result of that is an over-prediction for near field power density. It is taken as worst case to specify the safety range. 2.2 LIMIT Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following Table. Report No.: LGT26F042HA02 Page 7 of 8 The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm 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 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 ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. Report No.: LGT26F042HA02 Page 8 of 8 2.3 TEST RESULT Turn up Result Mode Turn up Power BLE 1M-GFSK -1.5±1dBm BLE 2M-GFSK -1.5±1dBm 2.4G -0.5±1dBm The MPE result of worst mode: RF Function Frequency (MHz) Max Turn up Power (dBm) Max Turn up Power (mW) Estimated SAR Limit Ratio Result BLE 2480 -0.50 0.8912509 0.2807087 3 0.0935696 Pass 2.4G 2480 0.50 1.1220185 0.3533913 3 0.1177971 Pass Note: 1. The RF Exposure is less than the limit, complies with the exemption requirements. ※※※※※END OF THE REPORT※※※※※

The test report is effective only with both signature and specialized stamp. This report shall not be reproduced except in full without the written approval of the Laboratory. The results in this report only apply to the tested sample. Shenzhen LGT Test Service Co., Ltd. Tel: 0755-89668180 E-mail:[email protected] Web: www.lgt-cert.com Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Page 1 of 53 RF TEST REPORT Product Name: Mechanical Keyboard Model Number: TUNE 65, SN002 FCC ID: 2BVGJ-TUNE65 Issued For : Sisun Electronics Technology (DG) CO., LTD Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Issued By : Shenzhen LGT Test Service Co., Ltd. Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Report Number: LGT26F042RF03 Sample Received Date: Jun. 04, 2026 Date of Test: Jun. 04, 2026 ~ Jun. 15, 2026 Date of Issue: Jun. 15, 2026 Report No.: LGT26F042RF03 Page 2 of 53 TEST REPORT CERTIFICATION Applicant: Sisun Electronics Technology (DG) CO., LTD Address: Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Manufacturer: Sisun Electronics Technology (DG) CO., LTD Address: Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Product Name: Mechanical Keyboard Trademark: N/A Model Number: TUNE 65, SN002 Sample Status: Normal APPLICABLE STANDARDS STANDARD TEST RESULTS FCC Part 15.247, Subpart C ANSI C63.10-2020 + Cor.1-2023 PASS Prepared by: Approved by: Chris Chen Vita Li Engineer Technical Director Report No.: LGT26F042RF03 Page 3 of 53 Table of Contents Page 1. SUMMARY OF TEST RESULTS 6 1.1 TEST LABORATORY 7 1.2 MEASUREMENT UNCERTAINTY 7 2. GENERAL INFORMATION 8 2.1 GENERAL DESCRIPTION OF THE EUT 8 2.2 DESCRIPTION OF THE TEST MODES 9 2.3 TEST SOFTWARE AND POWER LEVEL 9 2.4 DESCRIPTION OF NECESSARY ACCESSORIES AND SUPPORT UNITS 10 2.5 EQUIPMENTS LIST 11 3. EMC EMISSION TEST 13 3.1 CONDUCTED EMISSION MEASUREMENT 13 3.2 TEST PROCEDURE 14 3.3 TEST SETUP 14 3.4 EUT OPERATING CONDITIONS 14 3.5 TEST RESULTS 15 4. RADIATED EMISSION MEASUREMENT 17 4.1 RADIATED EMISSION LIMITS 17 4.2 TEST PROCEDURE 19 4.3 TEST SETUP 19 4.4 EUT OPERATING CONDITIONS 20 4.5 FIELD STRENGTH CALCULATION 20 4.6 TEST RESULTS (BAND EDGE REQUIREMENTS) 25 5. CONDUCTED SPURIOUS & BAND EDGE EMISSION 27 5.1 LIMIT 27 5.2 TEST PROCEDURE 27 5.3 TEST SETUP 27 5.4 EUT OPERATION CONDITIONS 27 5.5 TEST RESULTS 27 6. POWER SPECTRAL DENSITY TEST 28 6.1 LIMIT 28 6.2 TEST PROCEDURE 28 6.3 TEST SETUP 28 6.4 EUT OPERATION CONDITIONS 28 Report No.: LGT26F042RF03 Page 4 of 53 6.5 TEST RESULTS 28 7. BANDWIDTH TEST 29 7.1 LIMIT 29 7.2 TEST PROCEDURE 29 7.3 TEST SETUP 29 7.4 EUT OPERATION CONDITIONS 29 7.5 TEST RESULTS 29 8. PEAK OUTPUT POWER TEST 30 8.1 LIMIT 30 8.2 TEST PROCEDURE 30 8.3 TEST SETUP 30 8.4 EUT OPERATION CONDITIONS 30 8.5 TEST RESULTS 30 9. ANTENNA REQUIREMENT 31 9.1 STANDARD REQUIREMENT 31 9.2 EUT ANTENNA 31 APPENDIX I - TEST RESULTS 32 1. DUTY CYCLE 32 2. BANDWIDTH 35 3. MAXIMUM CONDUCTED OUTPUT POWER 40 4. MAXIMUM POWER SPECTRAL DENSITY 43 5. UNWANTED EMISSIONS IN NON-RESTRICTED FREQUENCY BANDS 46 APPENDIX II - MEASUREMENT PHOTOS 53 Report No.: LGT26F042RF03 Page 5 of 53 Revision History Rev. Issue Date Revisions 00 Jun. 15, 2026 Initial Issue Report No.: LGT26F042RF03 Page 6 of 53 1. SUMMARY OF TEST RESULTS Test procedures according to the technical standards: KDB 558074 D01 Part 15.247 Meas Guidance v05r02. FCC Part 15.247, Subpart C Standard Section Test Item Judgment Remark 15.207 Conducted Emission PASS -- 15.247 (a)(2) 6dB Bandwidth PASS -- 15.247 (b)(3) Output Power PASS -- 15.209 Radiated Spurious Emission PASS -- 15.247 (d) Conducted Spurious & Band Edge Emission PASS -- 15.247 (e) Power Spectral Density PASS -- 15.205 Restricted Band Edge Emission PASS -- Part 15.247(d)/ Part 15.209(a) Band Edge Emission PASS -- 15.203 Antenna Requirement PASS -- NOTE: (1) ‘N/A’ denotes test is not applicable in this Test Report. (2) All tests are according to ANSI C63.10-2020 + Cor.1-2023. Report No.: LGT26F042RF03 Page 7 of 53 1.1 TEST LABORATORY Company Name: Shenzhen LGT Test Service Co., Ltd. Address: Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Accreditation Certificate: FCC Registration No.: 746540 CAB ID: CN0136 1.2 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 %. No. Item Uncertainty 1 Occupied Channel Bandwidth ±0.46% 2 RF Output Power, Conducted ±0.71dB 3 Power Spectral Density, Conducted ±1.57dB 4 Unwanted Emission, Conducted ±0.63dB 5 Conducted emission ±2.80dB 6 All Emissions, Radiated (0.009-30MHz) ±2.16dB 7 All Emissions, Radiated (30MHz-1GHz) ±4.61dB 8 All Emissions, Radiated (1GHz-18GHz) ±5.49dB 9 Temperature ±0.5°C 10 Humidity ±2% 11 Duty Cycle ±2.3% Note: The measurement uncertainty is not included in the test result. Report No.: LGT26F042RF03 Page 8 of 53 2. GENERAL INFORMATION 2.1 GENERAL DESCRIPTION OF THE EUT Product Name: Mechanical Keyboard Test Model Number: TUNE 65 Series Number: SN002 Model Difference: The names are different. Product Description: Operation Frequency: 2402~2480 MHz Modulation Type: GFSK Radio Technology: BLE Bluetooth Configuration: BLE (1M PHY, 2M PHY) Number Of Channel: 40 Antenna Designation: PCB Antenna Antenna Gain (dBi) 2.59 Channel List: Please refer to the Note 3. Rating: Input: DC 5V 1000mA Battery: Capacity: 4000mAh Rated Voltage: 3.7V Hardware Version: N/A Software Version: 102 Connecting I/O Port(s): Please refer to the Note 1. Note: 1. For a more detailed features description, …

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天线规格书 RDMCTMZT-RF01 Model name：RDMCTMZT-RF01 Project Type：Built-in antenna on the keyboard Date：2024-05-24 Manufacturer: Sisun Electronics Technology (DG) CO., LTD Address: Sisun industrial park, Xikeng road, Puxin village, Shipai town, Dongguan, Guangdong, China Antenna plan view： Unit: mm 电气技术参数 Electrical technical parameters 电 性 能 指 标 Electrical Specifications 频率范围 2400-2500MHz Frequency Range 2400-2500MHz 电压驻波比 ＜1.92 VSWR ＜1.92 输入阻抗 50 Ω Input Impedance 50 Ω 方向全向 Direction All 增益 2.0±1dBi Gain 2.0±1dBi 机 械 指 标 Mechanical Specifications 接口形式 OPEN Input connector OPEN 工作温度 -20°C~+70°C Working Temperature -20°C~+70°C 工作湿度 20%~80% Working Humidity 20%~80% Antenna Type: PCB Antenna Antenna performance test chart: Test data（2.4G）: FrequencyEfficiency (%) Gain. (dBi) 2400MHz 43.852.46 2410MHz 45.922.36 2420MHz 46.132.10 2430MHz 46.882.13 2440MHz 47.102.27 2450MHz 48.192.49 2460MHz 47.532.44 2470MHz 48.752.59 2480MHz 46.772.39 2490MHz 47.422.36 2500MHz 45.602.21 Phi 0 3D Picture:Phi 90 3D Picture 2400MHz 2450MHz 2500MHz

Page 1 of 2 Report No.: LGT26F042 Appendix - Test Setup photos Set-up for Radiated Spurious Emission, Below 1GHz Set-up for Radiated Spurious Emission, Above 1GHz Page 2 of 2 Report No.: LGT26F042 Set-up for Conducted Emission