2BR4K-THMBUPThumbtroller

StuckAtPrototype LLC Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 [December 17, 2025] U.S. Agent Designation [StuckAtPrototype LLC] acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment for which authorization is sought FCC ID: 2BR4K-THMBUP Name and company of U.S. agent: [GLOCERTS TECHNOLOGY INC] Physical U.S. address of agent: [19784 SUNKISSED RIDGE DR, RIVERSIDE, CA 92507] FRN of U.S. agent: [0036339737] Email address of U.S. agent: [[email protected]] Telephone of U.S.agent: (626) 588-8039 [GLOCERTS TECHNOLOGY INC] acknowledges their obligation to accept service of process on behalf of [StuckAtPrototype LLC]. [StuckAtPrototype LLC] with the FRN [0037487972] accepts its obligation to maintain an agent for service of process in the United States for no less than 1 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. By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(d)(7). 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. Sincerely, Signature Signature [Damian Glinojecki] [Huiying Fan] [Owner] [Director] [StuckAtPrototype LLC] [GLOCERTS TECHNOLOGY INC]

StuckAtPrototype LLC (December 16, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for FCC ID: 2BR4K-THMBUP [StuckAtPrototype LLC] (“the applicant”) 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. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber-security or anti-virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, (Applicant signature) (Applicant printed name) Damian Glinojecki StuckAtPrototype LLC (December 16, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for FCC ID: 2BR4K-THMBUP [StuckAtPrototype LLC] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) Damian Glinojecki

Letter of Authorization Hello , We allow authorization for our Esp1'99Slf Systems (Shanghai) Co., Ltd a nd ESP32-H2-MINl-1 module product to be used by StuckA1P叫呴户LLCo n the remote control named Thumbroller and model SAPTH001A, and module SAPTH001A F CC I D :2AC 7 Z-ESPH2MINI1. Company name: Espressif Systems (Shanghai) Co., Ltd Contact Name: Mia Zhou Contact phone number: (8621)61065209 Contact Signature: 心沁扎 ro 、 夸克扫描王 极速扫描， 就是高效

StuckAtPrototype LLC (December 16, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Thumbtroller / SAPMR001A / FCC ID: 2BR4K-THMBUP) To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☒ Internal Photos ☐ NOTE 1 ☒ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No required to be submitted with this application be permanently withheld from public review. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Signature: Name: Damian Glinojecki Title: Owner

StuckAtPrototype LLC (December 16, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology Co., Ltd.) to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Signature: Name: Damian Glinojecki Title: Owner

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 3 Model: SAPMR001A External Photos Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 3 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 3

FCC ID LABEL: Label Location:

Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 42 TEST REPORT Compiled by: Reviewed by: Approved by: Zhang Mao cheng Martin Feng Rita Xiao / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: Thumbtroller FCC ID: 2BR4K-THMBUP Trademark: N/A Model Number: SAPMR001A Prepared For: StuckAtPrototype LLC Address: 1320 Arrow Point Dr Suite 501 #169 Cedar Park, TX 78613 USA Manufacturer: StuckAtPrototype LLC Address: 1320 Arrow Point Dr Suite 501 #169 Cedar Park, TX 78613 USA Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Aug. 21, 2025 Sample tested Date: Aug. 21, 2025 to Jan. 09, 2026 Issue Date: Jan. 09, 2026 Report No.: CTB25082106603RH01 Test Standards FCC 47 CFR Part2(2.1093), FCC 47 CFR Part1(1.1310) FCC 47 CFR Part1(1.1307), ANSI/IEEE C95.1-2019 IEEE 1528-2013 & Published RF Exposure KDB Procedures Test Results PASS Remark: This is SAR test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB25082106603RH01 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 42 Contents Page 1 COVER PAGE ......................................................................................................................................... 1 CONTENTS ....................................................................................................................................................................... 2 1. VERSION .................................................................................................................................................................. 4 2. PRODUCT INFORMATION AND TEST SETUP............................................................................................... 5 2.1 PRODUCT INFORMATION ................................................................................................................................... 5 3 EQUIPMENT USED DURING TEST ................................................................................................................... 6 3.1 EQUIPMENT LIST ............................................................................................................................................... 6 3.2 TEST EQUIPMENT CALIBRATION ....................................................................................................................... 7 4 SAR INTRODUCTION ........................................................................................................................................... 8 4.1 INTRODUCTION .................................................................................................................................................. 8 4.2 SAR DEFINITION ............................................................................................................................................... 8 5 SAR MEASUREMENT SETUP ............................................................................................................................. 9 5.1 SAR MEASUREMENT SETUP ...................................................................................................................... 9 5.2 DASY5 E-FIELD PROBE SYSTEM .................................................................................................................... 10 5.3 PROBE SPECIFICATION ..................................................................................................................................... 10 5.4 ISOTROPIC E-FIELD PROBE .............................................................................................................................. 10 5.5 PHANTOMS ...................................................................................................................................................... 11 5.6 DEVICE HOLDER .............................................................................................................................................. 11 6 SAR TEST PROCEDURE .................................................................................................................................... 12 6.1 SCANNING PROCEDURE ................................................................................................................................... 12 6.2 EXTRAPOLATION ............................................................................................................................................. 15 6.3 TEST POSITION – BODY CONFIGURATIONS ...................................................................................................... 15 7 EXPOSURE LIMIT ............................................................................................................................................... 16 7.1 UNCONTROLLED ENVIRONMENT ..................................................................................................................... 16 7.2 CONTROLLED ENVIRONMENT .......................................................................................................................... 16 8 SYSTEM AND LIQUID VALIDATION ............................................................................................................. 17 8.1 SYSTEM VALIDATION...........................................................................................…

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OTA TEST REPORT TA Technology (Shanghai) Co., Ltd. tested the above equipment in accordance with the requirements in ANSI/IEEE Std 149-2008. The test results show that the equipment tested is capable of demonstrating compliance with the requirements as documented in this report. Prepared by: Peng Tao Approved by: Kai Xu TA Technology (Shanghai) Co., Ltd. No.145, Jintang Rd, Tangzhen Industry Park, Pudong Shanghai, China TEL: +86‐021‐50791141/2/3 FAX: +86‐021‐50791141/2/3‐8000 Applicant Espressif System (Shanghai) Co.,Ltd Product ESP32-C3-MINI-1 Model ESP-ANT D-H Report No. Y2102A0260-T2 Issue Date March 9, 2021 OTA Test Report Report No: Y2102A0260-T2 TA Technology (Shanghai) Co., Ltd. TA-MB-04-008O P age 2 of 13 This report shall not be reproduced except in full, without the written approval of TA Technology (Shanghai) Co., Ltd. TABLE OF CONTENTS 1. Test Laboratory .............................................................................................................................. 3 1.1. Notes of the Test Report ................................................................................................... 3 1.2. Test facility ........................................................................................................................ 3 1.3. Testing Location ................................................................................................................ 3 1.4. Laboratory Environment .................................................................................................... 4 2. General Description of Equipment under Test ............................................................................... 5 2.1. Applicant and Manufacturer Information ............................................................................ 5 2.2. General information ........................................................................................................... 5 2.3. Test Date ........................................................................................................................... 5 2.4. Receiving Date .................................................................................................................. 5 2.5. Applied Standards ............................................................................................................. 6 3. Test Conditions .............................................................................................................................. 7 3.1. Test Configuration ............................................................................................................. 7 3.2. Test Measurement ............................................................................................................. 7 4. Test Results ................................................................................................................................... 8 4.1. Gain and Efficiency ............................................................................................................ 8 5. Equipment List ............................................................................................................................... 9 ANNEX A 3-D Pattern Plots ................................................................................................................... 10 ANNEX B：The EUT Appearance and Test Configuration ...................................................................... 12 B.1 EUT Appearance ................................................................................................................... 12 B.2 Test Configuration ................................................................................................................. 13 OTA Test Report Report No: Y2102A0260-T2 TA Technology (Shanghai) Co., Ltd. TA-MB-04-008O P age 3 of 13 This report shall not be reproduced except in full, without the written approval of TA Technology (Shanghai) Co., Ltd. 1. Test Laboratory 1.1. Notes of the Test Report This report shall not be reproduced in full or partial, without the written approval of TA technology (shanghai) co., Ltd. The results documented in this report apply only to the tested sample, under the conditions and modes of operation as described herein .Measurement Uncertainties were not taken into account and are published for informational purposes only. This report is written to support regulatory compliance of the applicable standards stated above. 1.2. Test facility A2LA (Certificate Number: 3857.01) TA Technology (Shanghai) Co., Ltd. has been listed by American Association for Laboratory Accreditation to perform measurement. 1.3. Testing Location Company: TA Technology (Shanghai) Co., Ltd. Address: No.145, Jintang Rd, Tangzhen Industry Park, Pudong Shanghai, China City: Shanghai Post code: 201201 Country: P. R. China Contact: Xu Kai Telephone: +86-021-50791141/2/3 Fax: +86-021-50791141/2/3-8000 Website: http://www.ta-shanghai.com E-mail: [email protected] OTA Test Report Report No: Y2102A0260-T2 TA Technology (Shanghai) Co., Ltd. TA-MB-04-008O P age 4 of 13 This report shall not be reproduced except in full, without the written approval of TA Technology (Shanghai) Co., Ltd. 1.4. Laboratory Environment Temperature Min. =19°C，Max. = 25°C Relative humidity Min. =40%，Max. =72% Shield effect 0.7-6GHz > 100dB Ground resistance <0.5 OTA Test Report Report No: Y2102A0260-T2 TA Technology (Shanghai) Co., Ltd. TA-MB-04-008O P age 5 of 13 This report shall not be reproduced except in full, without the written approval of TA Technology (Shanghai) Co., Ltd. 2. General Description of Equipment under Test 2.1. Applicant and Manufacturer Information Applicant Name Espressif System (Shanghai) Co.,Ltd Applicant address Suite 204 Block 2, 690 Bibo Road, Zhang Jiang Hi-Tech Park, Shanghai, China Manufacturer Name Espressif System (Shanghai) Co.,Ltd Manufacturer address Suite 204 Block 2, 690 Bibo Road, Zhang Jiang Hi-Tech Park, Shanghai, China 2.2. …

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Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 32 TEST REPORT Compiled by: Reviewed by: Approved by: Kai Chen Martin Feng Bin Mei / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: Thumbtroller FCC ID: 2BR4K-THMBUP Trademark: N/A Model Number: SAPMR001A Prepared For: StuckAtPrototype LLC Address: 1320 Arrow Point Dr Suite 501 #169 Cedar Park, TX 78613 USA Manufacturer: StuckAtPrototype LLC Address: 1320 Arrow Point Dr Suite 501 #169 Cedar Park, TX 78613 USA Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Aug. 21, 2025 Sample tested Date: Aug. 21, 2025 to Sep. 27, 2025 Issue Date: Sep. 27, 2025 Report No.: CTB25082106603RF02 Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2020 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB25082106603RF02 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 32 TABLE OF CONTENT Test Report Declaration Page 1. VERSION ........................................................................................................................................ 3 2. TEST SUMMARY ........................................................................................................................... 4 3. MEASUREMENT UNCERTAINTY ................................................................................................. 5 4. PRODUCT INFORMATION AND TEST SETUP ............................................................................ 6 4.1 Product Information .......................................................................................................................... 6 4.2 Test Setup Configuration .................................................................................................................. 6 4.3 Support Equipment........................................................................................................................... 6 4.4 Channel List ..................................................................................................................................... 7 4.5 Test Mode ........................................................................................................................................ 7 4.6 Test Environment ............................................................................................................................. 7 5. TEST FACILITY AND TEST INSTRUMENT USED ....................................................................... 8 5.1 Test Facility ...................................................................................................................................... 8 5.2 Test Instrument Used ....................................................................................................................... 8 6. AC POWER LINE CONDUCTED EMISSION ................................................................................ 11 6.1 Block Diagram Of Test Setup ......................................................................................................... 11 6.2 Limit ................................................................................................................................................ 11 6.3 Test procedure ............................................................................................................................... 11 6.4 Test Result ..................................................................................................................................... 13 7. RADIATED SPURIOUS EMISSION ............................................................................................. 15 7.1 Block Diagram Of Test Setup ......................................................................................................... 15 7.2 Limit ................................................................................................................................................ 15 7.3 Test procedure ............................................................................................................................... 16 7.4 Test Result ..................................................................................................................................... 17 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS ............................................... 24 8.1 Block Diagram Of Test Setup ......................................................................................................... 24 8.2 Limit ................................................................................................................................................ 24 8.3 Test procedure ............................................................................................................................... 24 8.4 Test Result ..................................................................................................................................... 25 9. COUDUCTED OUTPUT POWER ................................................................................................. 26 9.1 Block Diagram Of Test Setup ...........................................................................................…

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Sporton International Inc.(Kunshan) Page Number : 1 of 43 TEL : +86-512-57900158 Report Issued Date : Aug. 28, 2023 FCC ID: 2AC7Z-ESPH2MINI1 Report Version : Rev. 01 Report Template No.: BU5-FR15CBLE Version 2.0 FCC RF Test Report Report No. : FR342705A FCC RF Test Report APPLICANT : Espressif Systems (Shanghai) Co.,Ltd. EQUIPMENT : 2.4GHz Zigbee& Ble IoT Module BRAND NAME : ESPRESSIF MODEL NAME : ESP32-H2-MINI-1 FCC ID : 2AC7Z-ESPH2MINI1 STANDARD : FCC Part 15 Subpart C §15.247 CLASSIFICATION : (DTS) Digital Transmission System TEST DATE(S) : Jun. 13, 2023 ~ Aug. 02, 2023 We, Sporton International Inc. (Kunshan), would like to declare that the tested sample has been evaluated in accordance with the test procedures and has been in compliance with the applicable technical standards. The test results in this report apply exclusively to the tested model / sample. Without written approval of Sporton International Inc. (Kunshan), the test report shall not be reproduced except in full. Approved by: Jason Jia Sporton International Inc. (Kunshan) No. 1098, Pengxi North Road, Kunshan Economic Development Zone Jiangsu Province 215300 People’s Republic of China Sporton International Inc.(Kunshan) Page Number : 2 of 43 TEL : +86-512-57900158 Report Issued Date : Aug. 28, 2023 FCC ID: 2AC7Z-ESPH2MINI1 Report Version : Rev. 01 Report Template No.: BU5-FR15CBLE Version 2.0 FCC RF Test Report Report No. : FR342705A TABLE OF CONTENTS REVISION HISTORY .......................................................................................................................................... 3 SUMMARY OF TEST RESULT ......................................................................................................................... 4 1 GENERAL DESCRIPTION .......................................................................................................................... 5 1.1 Applicant ............................................................................................................................................ 5 1.2 Manufacturer ...................................................................................................................................... 5 1.3 Product Feature of Equipment Under Test ........................................................................................ 5 1.4 Product Specification of Equipment Under Test ................................................................................ 5 1.5 Modification of EUT ........................................................................................................................... 5 1.6 Testing Location ................................................................................................................................ 6 1.7 Test Software ..................................................................................................................................... 6 1.8 Applicable Standards ......................................................................................................................... 6 2 TEST CONFIGURATION OF EQUIPMENT UNDER TEST ........................................................................ 7 2.1 Carrier Frequency Channel ............................................................................................................... 7 2.2 Test Mode .......................................................................................................................................... 8 2.3 Connection Diagram of Test System ................................................................................................. 9 2.4 Support Unit used in test configuration and system ........................................................................ 10 2.5 EUT Operation Test Setup .............................................................................................................. 10 2.6 Measurement Results Explanation Example ................................................................................... 10 3 TEST RESULT .......................................................................................................................................... 11 3.1 6dB and 99% Bandwidth Measurement .......................................................................................... 11 3.2 Output Power Measurement ............................................................................................................ 18 3.3 Power Spectral Density Measurement ............................................................................................ 19 3.4 Conducted Band Edges and Spurious Emission Measurement ..................................................... 26 3.5 Radiated Band Edges and Spurious Emission Measurement ........................................................ 35 3.6 AC Conducted Emission Measurement........................................................................................... 39 3.7 Antenna Requirements .................................................................................................................... 41 4 LIST OF MEASURING EQUIPMENT ........................................................................................................ 42 5 MEASUREMENT UNCERTAINTY ............................................................................................................ 43 APPENDIX A. CONDUCTED TEST RESULTS APPENDIX B. AC CONDUCTED EMISSION TEST RESULT APPENDIX C. RADIATED SPURIOUS EMISSION APPENDIX D. DUTY CYCLE PLOTS APPENDIX E. SETUP PHOTOGRAPHS Sporton International Inc.(Kunshan) Page Number : 3 of 43 TEL : +86-512-57900158 Report Issued Date : Aug. 28, 2023 FCC ID: 2AC7Z-ESPH2MINI1 Report Version : Rev. 01 Report Template No.: BU5-FR15CBLE Version 2.0 FCC RF Test Report Report No. : FR342705A REVISION HISTORY REPORT NO. VERSION DESCRIPTION ISSUED DATE FR342705A Rev. 01 Initial issue of report Aug. 28, 2023 Sporton International Inc.(Kunshan) Page Number : 4 of 43 TEL…

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Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 1 Model: SAPMR001A Neck cheek for Body ( Front side) Body ( Back side) Body (Right Edge) Body (Left Edge) Body (Top Edge) Body (Bottom Edge) 0mm separation 0mm separat…

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