2BREX-SB20-W-11Self-powered Wireless Doorbell Activator, Self-powered Wireless Doorbell

36 Version vl.O 25-08-27 This device complies with part 1 5 of the FCC Rules. Operation is subjectto the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interferencethat may cause undesired operation Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuantto part 1 5 of the FCC Rules. These limits a『e designed to provide 『easonableprotection against harmful inte『ferencein 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 gua「anteethat interfe「encewill not occur in a pa「ticula「 installation. If this equipment does cause harmful interference to「adioor television reception, which can be dete『minedby turning the equipment off and on, the user is encou『agedto try toco『rectthe interference by one or more of the following measu『es: -Reorient or relocate the receiving antenna -Increase the separation between the equipment and 『ece,ver -Connect the equipment into an outlet on a circuit different from that to which the『eceiveris connected. -Consultthe dealer or an experienced radio/TV technician for help Note: The Grantee is not 『esponsiblefor any changes or modifications not expressly approved by the pa『tyresponsible for compliance. Such modi竹cationscould void the user's authority to operate the equipment The device has been evaluated to meet general RF exposure 『equi『ement E E00 " 9L War nin g A t t a c h m e n t c a r d LOS-0313

Boundless EC US LLC FCC ID: 2BREX-SB20-W-11 Date: 9/26/2025 Subject: authorization for adding family models To whom it May concern, Statement We confirm the product Self-powered Wireless Doorbell Activator, Self-powered Wireless Doorbell with models K5L, SB2.0-W-1.1, SB2.0-W-2.1. SB2.0-W-1.1 is a doorbell with a remote control, SB2.0-W-2.1 is a doorbell with two remote controls, and K5L is the model of the Doorbell Activator. Product name Model name Self-powered Wireless Doorbell Activator K5L Self-powered Wireless Doorbell SB2.0-W-2.1 SB2.0-W-1.1 Yours sincerely, [signature] David Boeggeman Supply Chain Manager Boundless EC US LLC

Boundless EC US LLC Aug. 15, 2025 E urofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 R E: Attestation StatementsPart 2.911(d)(5)(i) request for 2BREX-SB20-W-11 Boundless EC US 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. W e 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, David Boeggeman Boundless EC US LLC Aug. 15, 2025 E urofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for 2BREX-SB20-W-11 Boundless EC US 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, David Boeggeman

Rev 1/26/2023 Boundless EC US LLC F ederal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 08-15-2025 R ef: Attestation Statements Part 2.911(d)(7) Filing F CC ID: 2BREX-SB20-W-11 B oundless EC US LLC (“the applicant”) certifies that, as of the date of the filing of the application, we designate ourselves as the U.S. agent for service of process. D esignated U.S. Agent Information: FRN: 0037359197 Name: Boundless EC US LLC Address: 66 W Flagler Street Suite 900, #10703, Miami, FL 33130, United States Contact Person: David Boeggeman Tel.: (484) 880-7753 Email: [email protected] S incerely, Boundless EC US LLC David Boeggeman

Boundless EC US LLC Date: Aug. 15, 2025 Exhibit Type File Name Long-term confidentiality: Schematics Block Diagram Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID:2BREX-SB20-W-11 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Operational Description Schematics.pdf Block Diagram.pdf Operational Description.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Boundless EC US LLC Signature David Boeggeman / Supply Chain Manager Typed name and Title

Boundless EC US LLC FCC ID : 2BREX-SB20-W-11 POWER OF ATTORNEY Date: Aug. 15, 2025 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 To Whom It May Concern: We, the undersigned, hereby authorize Waltek Testing Group Co., Ltd. (Deval Qin) on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by Waltek Testing Group Co., Ltd. (Deval Qin) on our behalf shall have the same effect as acts of our own. This authorization expires on Aug. 14, 2026. Sincerely, Bo undless EC US LLC Signature David Boeggeman / Supply Chain Manager Typed name and Title

Appendix-K5L-Photos Page 3 of 7 2. Photographs –Constructional Details 2.1. EUT – External View Model K5L FCC ID: 2BREX-SB20-W-11 Appendix-K5L-Photos Page 4 of 7 Appendix-K5L-Photos Page 5 of 7

Appendix-K5L-Photos Page 6 of 7 2.2. EUT – Internal View Model K5L FCC ID: 2BREX-SB20-W-11 Appendix-K5L-Photos Page 7 of 7 Ant.

Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Page 1 of 8 TEST REPORT Referen ce No. .................... : WTN25D08211871W002 FCC ID ................................ : 2BREX-SB20-W-11 Applicant ............................ : Boundless EC US LLC Address .............................. : 66 W Flagler Street Suite 900, Miami, Florida, 10703, United States Manufacturer .................... : Wuhan Linptech Co., Ltd Address .............................. : Rm 305, R&D Center, No. 8, Fortune Second Road, Donger Industrial Park, East Lake New Technology Development Zone, Wuhan, Hubei, China Product ............................... : Refer to the section 4.3. Model(s). ............................ : K5L, SB2.0-W-1.1, SB2.0-W-2.1 Standards........................... : FCC 47CFR Part 2 Subpart J Section 2.1093 Date of Receipt sample .... : 2025-08-12 Date of Test ....................... : 2025-08-15 to 2025-09-17 Date of Issue ...................... : 2025-09-26 Test Result ......................... : Pass Remarks: The re sults shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of compiler and approver. Prepared By: Waltek Testing Group Co., Ltd. Address: No. 77, Houjie Section, Guantai Road, Houjie Town, Dongguan City, Guangdong, China Tel: +86-769-2267 6998 Fax: +86-769-2267 6828 Compiled by: Approved by: Estel Qian / Project Engineer Deval Qin / Designated Reviewer Reference No.: WTN25D08211871W002 Page 2 of 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 2. Contents Page 1 COVER PAGE ........................................................................................................................................... 1 2. CONTENTS ............................................................................................................................................... 2 3. REVISION HISTORY ................................................................................................................................. 3 4. GENERAL INFORMATION ....................................................................................................................... 4 4.1. GENERAL DESCRIPTION OF E.U.T.................................................................................................... 4 4.2. DETAILS OF E.U.T. ......................................................................................................................... 4 4.3. MODEL LIST .................................................................................................................................... 4 4.4. TEST FACILITY ................................................................................................................................ 4 4.5. SUBCONTRACTED ........................................................................................................................... 5 4.6. ABNORMALITIES FROM STANDARD CONDITIONS ................................................................................ 5 5. TEST SUMMARY ...................................................................................................................................... 6 6. RF EXPOSURE ......................................................................................................................................... 7 6.1. PROCEDURES AND REQUIREMENTS ................................................................................................. 7 6.2. MPE CALCULATION METHOD........................................................................................................... 7 6.3. RADIO FREQUENCY RADIATION EXPOSURE EVALUATION ................................................................... 7 Reference No.: WTN25D08211871W002 Page 3 of 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 3. Revision History Test Report No. Date of Receipt Sample Date of Test Date of Issue Purpose CommentApproved WTN25D08211871W002 2025-08-12 2025-08-15 to 2025-09-17 2025-09-26Original - Valid Reference No.: WTN25D08211871W002 Page 4 of 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 4. General Information 4.1. General Description of E.U.T. Product Name: Refer to the section 4.3. Model No.: K5L, SB2.0-W-1.1, SB2.0-W-2.1 Model Description: SB2.0-W-1.1 is a doorbell with a remote control, SB2.0-W-2.1 is a doorbell with two remote controls, and K5L is the model of the Doorbell Activator. Model K5L was tested in the report. Hardware Version: K5L-FS V1.0 Software Version: V2.0 4.2. Details of E.U.T. Frequency Range: 433.92±0.5MHz Type of Modulation: FSK Antenna installation: Monopole antenna Antenna Gain N/A Note: #: The antenna gain is provided by the applicant, and the applicant should be responsible for its authenticity, WALTEK lab has not verified the authenticity of its information. Power Supply: Self-powered 4.3. Model list Product name Model name Self-powered Wireless Doorbell Activator K5L Self-powered Wireless Doorbell SB2.0-W-2.1 SB2.0-W-1.1 4.4. Test Facility The test facility has a test site registered with the following organizations: ISED CAB identifier: CN0013. Test Firm Registration No.: 7760A. Waltek Testing Group Co., Ltd. Has been registered and fully described in a report filed with the Industry Canada. The acceptance letter from the Industry Canada is maintained in our files. Registration number 7760A, October 15, 2016. FCC Designation No.: CN1201. Test Firm Registration No.: 523476. Waltek Testing Group Co., Ltd. EMC Laboratory has been registered and fully described in a report filed with the (FCC) Federal Communications Commission. The acceptance letter from the FCC is maintained in our files. Registration number 523476, September 10, 2019. Reference No.: WTN25D08211871W002 Page 5 of 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 4.5. Subcontracted…

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Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Page 1 of 17 TEST REPORT Reference No..................... : WTN25D08211871W001 FCC ID ................................ : 2BREX-SB20-W-11 Applicant ........................... : Boundless EC US LLC Address ............................. : 66 W Flagler Street Suite 900, Miami, Florida, 10703, United States Manufacturer .................... : Wuhan Linptech Co., Ltd Address ............................. : Rm 305, R&D Center, No. 8, Fortune Second Road, Donger Industrial Park, East Lake New Technology Development Zone, Wuhan, Hubei, China Product .............................. : Refer to the section 4.3. Model(s). ............................ : K5L, SB2.0-W-1.1, SB2.0-W-2.1 Standards .......................... : FCC 47CFR Part 15 Subpart C Section 15.231 Date of Receipt Sample .... : 2025-08-12 Date of Test ....................... : 2025-08-15 to 2025-09-17 Date of Issue ..................... : 2025-09-26 Test Result ........................ : Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of compiler and approver. Prepared By: Waltek Testing Group Co., Ltd. Address: No. 77, Houjie Section, Guantai Road, Houjie Town, Dongguan City, Guangdong, China Tel: +86-769-2267 6998 Fax: +86-769-2267 6828 Compiled by: Approved by: Estel Qian / Project Engineer Deval Qin /Designated Reviewer Reference No.: WTN25D08211871W001 Page 2 of 17 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 2 Contents Page 1 COVER PAGE ........................................................................................................................................... 1 2 CONTENTS ............................................................................................................................................... 2 3 REVISION HISTORY ................................................................................................................................. 3 4 GENERAL INFORMATION ....................................................................................................................... 4 4.1 GENERAL DESCRIPTION OF E.U.T.................................................................................................... 4 4.2 DETAILS OF E.U.T. ......................................................................................................................... 4 4.3 MODEL LIST .................................................................................................................................... 4 4.4 TEST MODE .................................................................................................................................... 4 5 EQUIPMENT USED DURING TEST ......................................................................................................... 5 5.1 EQUIPMENTS LIST ........................................................................................................................... 5 5.2 MEASUREMENT UNCERTAINTY ......................................................................................................... 6 5.3 TEST EQUIPMENT CALIBRATION ....................................................................................................... 6 5.4 TEST FACILITY ................................................................................................................................ 6 5.5 SUBCONTRACTED ........................................................................................................................... 6 6 TEST SUMMARY ...................................................................................................................................... 7 7 RADIATED SPURIOUS EMISSIONS ....................................................................................................... 8 7.1 EUT OPERATION ............................................................................................................................ 8 7.2 TEST SETUP ................................................................................................................................... 9 7.3 SPECTRUM ANALYZER SETUP ........................................................................................................ 10 7.4 TEST PROCEDURE ........................................................................................................................ 11 7.5 SUMMARY OF TEST RESULTS ........................................................................................................ 11 8 PERIODIC OPERATION ......................................................................................................................... 13 9 EMISSION BANDWIDTH ........................................................................................................................ 16 9.1 TEST PROCEDURE ........................................................................................................................ 16 9.2 TEST RESULT ............................................................................................................................... 16 10 ANTENNA REQUIREMENT ................................................................................................................... 17 11 RF EXPOSURE ....................................................................................................................................... 17 12 PHOTOGRAPHS –TEST SETUP AND EUT .......................................................................................... 17 Reference No.: WTN25D08211871W001 Page 3 of 17 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 3 Revision History Test Report No. Date of Receipt Sample Date of Test Date of Issue Purpose CommentApproved WTN25D08211871W001 2025-08-12 2025-08-15 to 2…

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K5L_Antenna Spec Model: K5L Antenna Type: Monopole antenna Operation Frequency: 430~447MHz Material: Copper Size:

Appendix-K5L-Photos Page 1 of 7 1. Test Setup photos Model K5L FCC ID: 2BREX-SB20-W-11 1.1 Photograph – Radiated Emissions For 9kHz-30MHz Test Site 2# For 30MHz-1000MHz Test Site 2# Appendix-K5L-Photos Page 2 of 7 For Above 1GHz Test Site 1#