2BTZ2-ST013LOST GUARD

Shenzhen Bambay Technology Co., Limited Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 [May 26, 2026] U.S. Agent Designation [Shenzhen Bambay Technology Co., Limited] 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: 2BTZ2-ST013 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 [Shenzhen Bambay Technology Co., Limited]. [Shenzhen Bambay Technology Co., Limited] with the FRN [0037821063] 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 [hao Hu] [Huiying Fan] [Manager] [Director] [Shenzhen Bambay Technology Co., Limited] [GLOCERTS TECHNOLOGY INC]

Shenzhen Bambay Technology Co., Limited (May 25, 2026) 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: 2BTZ2-ST013 [Shenzhen Bambay Technology Co., Limited] (“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) hao Hu Shenzhen Bambay Technology Co., Limited (May 25, 2026) 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: 2BTZ2-ST013 [Shenzhen Bambay Technology Co., Limited] (“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) hao Hu

Shenzhen Bambay Technology Co., Limited (May 25, 2026) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (LOST GUARD / ST013 / FCC ID: 2BTZ2-ST013) 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: hao Hu Title: Manager

Shenzhen Bambay Technology Co., Limited (May 25, 2026) 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: hao Hu Title: Manager

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 4 Model: ST013 External Photos Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 4

FCC ID LABEL: Label Location: FCC ID: 2BTZ2-ST013 Model No.: ST013

Shenzhen CTB Testing Technology Co., Ltd. FCC ID: 2BTZ2-ST013 Portable device According to §15.247(e)(i) and §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. According to KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR 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 When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. BLE: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 1.432 1.39 1±1 2.00 1.58 <5 0.49127 3.00 YES 2.44 1.483 1.41 1±1 2.00 1.58 <5 0.49514 3.00 YES 2.480 1.274 1.34 1±1 2.00 1.58 <5 0.49918 3.00 YES GFSK Conclusion: For the max result : 0.49918≤ FCC Limit 3.0 for 1g SAR.

Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 34 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. The tested sample(s) and the sample information are provided by the applicant. The authenticity, accuracy, and completeness of the provided information are the sole responsibility of the applicant. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The result decision rules of our laboratory are based solely on the direct comparison between the actual measured values of test results and the standard limits, without considering the measurement uncertainty.“” indicates the testing items were fulfilled by subcontracted lab. “” indicates the items are not in CNAS accreditation scope. Test item description: LOST GUARD FCC ID: 2BTZ2-ST013 Trademark(s): DERAX Model/Type reference: ST013 Applicant’s name: Shenzhen Bambay Technology Co., Limited Address: Room 204, 2F, Building A3, Hekan Industrial Park, No.41, Wuhe Avenue (South), Nankeng Community, Bantian Street, Longgang District, Shenzhen Manufacturer: Shenzhen Bambay Technology Co., Limited Address: Room 204, 2F, Building A3, Hekan Industrial Park, No.41, Wuhe Avenue (South), Nankeng Community, Bantian Street, Longgang District, Shenzhen 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: May. 19, 2026 Sample tested Date: May. 19, 2026 to May. 22, 2026 Issue Date: May. 22, 2026 Report No.: CTB26051900901RF01 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.: CTB26051900901RF01 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 34 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 ............................................................................................. 14 7.1 Block Diagram Of Test Setup ......................................................................................................... 14 7.2 Limit ................................................................................................................................................ 14 7.3 Test procedure ............................................................................................................................... 14 7.4 Test Result ..................................................................................................................................... 16 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS ............................................... 23 8.1 Block Diagram Of Test Setup ......................................................................................................... 23 8.2 Limit ................................................................................................................................................ 23 8.…

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Summary Inverted F Antenna Specification ITEM ANT SPEC Model Name 2.4G ANT Center Frequency 2400MHz 2450MHz 2500MHz 2.12 2.18 2.20 MAX. Gain 2.20 dBi Azimuth Beam Pattern Omni-directional Manufacture Antenna Photo & Length (mm) Since there is no ground plane beneath the antenna, PCB thickness will have little effect on the performance. The results presented in this design note are based on an antenna implemented on a PCB with 1 mm thickness. Impedance 50 Ohm 2400 MHz 2450 MHz 2500 MHz Max: 2.3dBi Min: -1.7dBi Scale: 0.5/div ANT Test Labs：Attestation of Global Compliance Co., Ltd. 2.3 dBi 1.8 dBi 1.3 dBi 0.8 dBi 0.3 dBi - 0.2 dBi - 0.7 dBi - 1.2 dBi - 1.7 dBi Frequency (MHz) Gain (dBi) Max Min 2400 2.12 -0.60 2450 2.18 -1.60 2500 2.20 0.10

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 1 Model: ST013 Radiated Emission Below 1G Above 1G