2BR3K-DOORBELL-U52Doorbell Camera

HK EKO ELECTRONICS LIMITED FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Attestation Statements Not Covered EntityApplicant &Not Covered Equipment To: Federal Communications CommissionDate: Sep 11, 25 7435 Oakland Mills Road, Columbia, MD 21046, USA Ref: Information Required by Section 2.911(d)(5)(i)& (ii) FCC ID: 2BR3K-DOORBELL-U52 HK EKO ELECTRONICS LIMITED(“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List, established pursuant to § 1.50002 of reference chapter, as an entity producing “covered” communication equipment. The equipment for which authorization is sought is not “covered” telecommunications equipment and video surveillance equipment produced by entities identified on the Commission’s Covered List that prohibited from receiving an equipment authorization pursuant to section§ 2.903of the FCC rules. Sincerely yours, Applicant Signature Printed Name: Lily Liu Title: Manager Address: FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Tel.: 8613603013341 Email:[email protected]

1| Page HK EKO ELECTRONICS LIMITED FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Attestation Statements To: Federal Communications CommissionDate: Dec 08, 25 7435 Oakland Mills Road, Columbia, MD 21046, USA Subject: Attestation of Compliance with FCC Covered List Software Requirements FCC ID: 2BR3K-DOORBELL-U52 Product Name: Doorbell Camera This letter serves as an attestation that the equipment identified above ☐ is / ☒ is not (select one) "covered" software as defined under the Federal Communications Commission (FCC) Covered List requirements, as outlined in FCC 22-84 and KDB 986446. Specifically, the undersigned certifies that the equipment for which authorization is sought: 1.Does not contain c ybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors, assignees, parents, subsidiaries, affiliates, or any entity that has rebranded or relabeled software produced by the aforementioned entities. 2.Does not have the capability to store, run, or deliver any software identified on the FCC Covered List, including but not limited to cybersecurity and anti-virus software. To support this attestation, the appendixevaluation documentation has been prepared and is included in the certification filing. This attestation is based on a thorough evaluation of the device's design, functionality, and software environment. The undersigned affirms that the information provided is accurate and complete to the best of their knowledge. Sincerely yours, Applicant Signature Printed Name: Lily Liu Title: Manager Address: FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Tel.: 8613603013341 Email:[email protected] HK EKO ELECTRONICS LIMITED FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China 2| Page Evaluation regarding to the Covered List Software: Compliance Methodology Evaluation Process Results Device is Inherent compliance ☑ The Chipset(s) used is limited to run the Cybersecurity or anti-virus software. Compliance ☑ The Memory used is limited to run the Cybersecurity or anti-virus software. Compliance ☑ There is storage capacitylimitation for store or install the Cybersecurity or anti-virus software. Compliance ☑ Operatingsystem used is limited to run, install or deliver the Cybersecurity or anti-virus software. Compliance Device is not Inherent compliance ☐ Evaluation Based on Software Bill of Materials (SBoM) See attached “SBoM“ Note:The SBoM content is limited to the scope of covered list software (e.g. antivirus and cybersecurity software). ☐ Evaluation Based on Scan for Software on the device ☐ Evaluation Based on Filesystem scan ☐ Evaluation Based on Running software check

[HK EKO ELECTRONICS LIMITED] [ FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET] [ MONG KOK KL, HONGKONG] [ China] Date: [2025-12-10] Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: [2BR3K-DOORBELL-U52] FRN: [0037481041] US Agent – Attestation Statement / Part 2.911(d)(7) [HK EKO ELECTRONICS LIMITED]certifies, that as of [2025-12-10], we have designated FCC US Agent, LLC to accept service of process on our behalf for FCC ID: [2BR3K-DOORBELL- U52]. [HK EKO ELECTRONICS LIMITED], accepts to maintain an agent of 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. FCC US Agent, LLC, accepts as of the date of the filing of this application, the obligation of being the designated agent for the purpose of accepting service of process on behalf of [HK EKO ELECTRONICS LIMITED] for FCC ID: [2BR3K-DOORBELL-U52]. Designated Agent Information: Company Name: FCC US Agent, LLC FRN: 0033402884 Address: 3722 Illinois Avenue, Saint Charles, IL, 60174, USA Contact Person: Tim Payne Phone: 708-571-3148 Email: [email protected] Sincerely, Company: [HK EKO ELECTRONICS LIMITED] Designated Agent: FCC US Agent, LLC Company Representative: [Lily Liu] Designated Agent Representative: Tim Payne Signature: [] Signature:

HK EKO ELECTRONICS LIMITED FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Statement Product: Doorbell Camera Model:U52 Additional Model:V52, K52, N52, X52, Z52 Trademark: N/A FCC ID: 2BR3K-DOORBELL-U52 We hereby state that U52 is tested model, other models are derivative models. The models are identical in circuit and PCB layout, different on the model names and color. So the test data of U52 can represent the remaining models. Your assistance on this matter is highly appreciated. Yours sincerely, Signature: Date: 2025/12/08 Name: Lily Liu Company Name: HK EKO ELECTRONICS LIMITED Address: FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Tel / Fax: 8613603013341/N/A E-Mail: [email protected]

HK EKO ELECTRONICS LIMITED FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China 12.08.2025 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request for: FCC ID: 2BR3K-DOORBELL-U52 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby requestpermanent confidential treatment of the exhibits accompanying thiscertification application as outlined below : The above exhibits contain trade secrets and/or proprietary information that are not publicly available and materials that the Applicant has spent considerable efforts in developing. Public disclosure of these may be harmful to the Applicant and give an unfair advantage to competitors on the market. Sincerely, (Signature) Printed Name: Lily Liu Title: Manager Address: FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Tel.: 8613603013341 Email:[email protected] Block Diagram Schematics  Operational Description

HK EKO ELECTRONICS LIMITED FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China (12.08.2025) Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization for FCC ID: 2BR3K-DOORBELL-U52 I, the undersigned, hereby authorize (SHENZHEN TONGCE TESTING LAB) to act on our behalfin all matters relating to this application for equipment certification. Any act carried out by (SHENZHEN TONGCE TESTING LAB) shall have the same effect as our own and I acknowledge that all responsibility for complying with the terms and conditions of certification, as specified by DERYCOM CERTIFICATION SERVICES, INC., still resides with (HK EKO ELECTRONICS LIMITED). We certify that we are not subject to a denial of federal benefits that includes FCC benefitspursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. §862, and that no partyto the application, as defined in 47 CFR §1.2002(b), is subject to a denial of federal benefits that includes FCC benefits pursuant to that section. Sincerely, (Signature) Name: Lily Liu Title: Manager Tel.: 8613603013341 Fax: N/A Email: [email protected]

Report No.: TCT251201E034-B Page 1 of 4 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Appendix- External Photographs of EUT Product: Doorbell Camera Model: U52 Report No.: TCT251201E034-B Page 2 of 4 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT251201E034-B Page 3 of 4 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT251201E034-B Page 4 of 4 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com

Label Artwork and Location Model: U52 Label: Size: L*W=30*8mm Location FCC ID: 2BR3K-DOORBELL-U52

Report No.: TCT251201E034-C Page 1 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Appendix- Internal Photographs of EUT Product: Doorbell Camera Model: U52 BLE/WIFI Antenna Report No.: TCT251201E034-C Page 2 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT251201E034-C Page 3 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT251201E034-C Page 4 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT251201E034-C Page 5 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT251201E034-C Page 6 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com

Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID. ............................ : 2BR3K-DOORBELL-U52 Test Report No. ............... : TCT251201E036 Date of issue ................... : Dec. 10, 2025 Testing laboratory .......... : SHENZHEN TONGCE TESTING LAB Testing location/ address: 2101 & 2201, Zhenchang Factory, Renshan Industrial Zone, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, 518103, People's Republic of China Applicant's name ............ : HK EKO ELECTRONICS LIMITED Address ........................... : FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Manufacturer's name ... : HK EKO ELECTRONICS LIMITED Address ........................... : FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Standard(s) ..................... : FCC CFR Title 47 Part 1.1307 Product Name ................. : Doorbell Camera Trade Mark ...................... : N/A Model/Type reference..... : U52, V52, K52, N52, X52, Z52 Rating(s).......................... : Rechargeable Li-ion Battery DC 3.7V Date of receipt of test item ......................................... : Dec. 01, 2025 Date (s) of performance of test ................................... : Dec. 01, 2025 ~ Dec. 10, 2025 Tested by (+signature) ... : Ronaldo LUO Check by (+signature) .... : Beryl ZHAO Approved by (+signature): Tomsin General disclaimer: This report shall not be reproduced except in full, without the written approval of SHENZHEN TONGCE TESTING LAB. This document may be altered or revised by SHENZHEN TONGCE TESTING LAB personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT251201E036 Page 2 of 7 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Table of Contents 1. General Product Information .................................................................. 3 1.1. EUT description ..................................................................................................... 3 1.2. Model(s) list ............................................................................................................ 3 2. General Information ................................................................................. 4 2.1. Test environment and mode ................................................................................. 4 2.2. Description of Support Units ................................................................................ 4 3. Facilities and Accreditations .................................................................. 5 3.1. Facilities ................................................................................................................. 5 3.2. Location ................................................................................................................. 5 4. Limit .......................................................................................................... 6 5. Test Results and Measurement Data ..................................................... 7 Report No.: TCT251201E036 Page 3 of 7 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. General Product Information 1.1. EUT description Product Name ....................... : Doorbell Camera Model/Type reference........... : U52 Sample Number....................: TCT251201E034-0101 Operation Frequency ........... : For BLE: 2402MHz~2480MHz For WIFI: 2412MHz~2462MHz (802.11b/802.11g/802.11n(HT20)) Modulation Type ................... : For BLE: GFSK For WIFI: 802.11b: Direct Sequence Spread Spectrum (DSSS) 802.11g/802.11n: Orthogonal Frequency Division Multiplexing (OFDM) Antenna Type ........................ : Internal Antenna Antenna Gain ........................ : 2.99dBi Rating(s)................................ : Rechargeable Li-ion Battery DC 3.7V Note: The antenna gain listed in this report is provided by applicant, and the test laboratory is not responsible for this parameter. 1.2. Model(s) list No. Model No. Tested with 1 U52 Other models V52, K52, N52, X52, Z52 Note: U52 is tested model, other models are derivative models. The models are identical in circuit and PCB layout, different on the model names and color. So the test data of U52 can represent the remaining models. Report No.: TCT251201E036 Page 4 of 7 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 2. General Information 2.1. Test environment and mode Item Normal condition Temperature +25ºC Voltage DC 3.7V Humidity 56% Atmospheric Pressure: 1008 mbar Test Mode: Transmitting Mode: Keep the EUT in continuous transmitting by select channel 2.2. Description of Support Units The EUT has been tested as an independent unit together with other necessary accessories or support units. The following support units or accessories were used to form a representative test configuration during the tests. Equipment Model No. Serial No. FCC ID Trade Name / / / / / Note: 1. All the equipment/cables were placed in the worst-case configuration to maximize the emission during the test. 2. Grounding was established in accordance with the manufacturer’s requirements and conditions for the intended use. 3. For conducted measurements (Output Power, 20dB Occupied Bandwidth, Carrier Frequencies Separation, Hopping Channel Number, Dwell Time, Spurious Emissions), the antenna of EUT is connected to the test equipment via temporary antenna connector, the antenna connector is soldered on the antenna port of EUT, and the temporary antenna connector is listed in the Test Instruments. Report No.: TCT251201E036 Page 5 of 7 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 3. Facilities and Accreditations 3.1. Facilities The test facility is recognized, certified, or accredited by the following organizations: …

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Shenzhen Zhongcheng communication products Co., Ltd Page 1 Antenna Approval Sheet For U5 2 Project CustomerEKENINNOVATIONProject U52 BandWiFi2.4GHZ ZCPNT21-043 VersionR:AData 2025-6-17 RF CheckedBy ConfirmedBy CustConfirm Shenzhen Zhongcheng communication products Co., Ltd Page 2 1.Manufacturer information Company
name：Shenzhen
Zhongcheng
communication
products
Co.,
Ltd Address:
5th
floor,
building
C,
Huafeng
Industrial
Zone,
Liuxian
Road,
71
District,

Bao'an,
Shenzhen Tel：0755-29995224 Fax：0755-27863505 2. Summary of the DUT U52 Picture Antenna Picture 3. Electrical Specification: Antenna typesBuilt-in WIFI Antenna Frequency2400-2500 MHZ Impedance 50 Ω VSWR< 2.0 PeaK Gain 2.99dBi REF Efficiency>35% Antenna MaterialCopper tube+coaxial line Connector Type1.13 MHF-1-Plug Shenzhen Zhongcheng communication products Co., Ltd Page 3 4. Test Condition 4.1 TEST ITEMTESTING INSTRUMENTREMARKS PASSIVE TEST 1.Antenna Gain 2. S.W.R 3. Return Loss 4. Radiation Pattern 1. Network analyzer （ R&S ZVL6 ） 2. Network analyzer （ HP8753D ） 4.2 Matching CircuitThe matching circuit was Default 4.3Antenna installation diagram: 5.1 RFPerformance –WIFIAntenna 5.1 Passive parameters Freq.(MHz)24002410242024302440245024602470248024902500 Gain (dBi)2.632.682.712.992.62.232.62.491.961.771.7 5.2 S Parameter Frequency (MHz)240024502480 Return Loss(dB)-22-18-16.9 VSWR1.251.321.36 Shenzhen Zhongcheng communication products Co., Ltd Page 4 5.3Antenna 3D Radiation Pattern (Unit:dbi) Shenzhen Zhongcheng communication products Co., Ltd Page 5 6. ME Drawing for the antenna

Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID. ............................ : 2BR3K-DOORBELL-U52 Test Report No. ............... : TCT251201E034 Date of issue ................... : Dec. 10, 2025 Testing laboratory .......... : SHENZHEN TONGCE TESTING LAB Testing location/ address: 2101 & 2201, Zhenchang Factory, Renshan Industrial Zone, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, 518103, People's Republic of China Applicant's name ............ : HK EKO ELECTRONICS LIMITED Address ........................... : FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Manufacturer's name ... : HK EKO ELECTRONICS LIMITED Address ........................... : FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Standard(s) ..................... : FCC CFR Title 47 Part 15 Subpart C Section 15.247 FCC KDB 558074 D01 15.247 Meas Guidance v05r02 ANSI C63.10:2020 Product Name ................. : Doorbell Camera Trade Mark ...................... : N/A Model/Type reference..... : U52, V52, K52, N52, X52, Z52 Rating(s).......................... : Rechargeable Li-ion Battery DC 3.7V Date of receipt of test item ......................................... : Dec. 01, 2025 Date (s) of performance of test ................................... : Dec. 01, 2025 ~ Dec. 10, 2025 Tested by (+signature) ... : Ronaldo LUO Check by (+signature) .... : Beryl ZHAO Approved by (+signature): Tomsin General disclaimer: This report shall not be reproduced except in full, without the written approval of SHENZHEN TONGCE TESTING LAB. This document may be altered or revised by SHENZHEN TONGCE TESTING LAB personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT251201E034 Page 2 of 56 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Table of Contents 1. General Product Information .................................................................. 3 1.1. EUT description ..................................................................................................... 3 1.2. Model(s) list ............................................................................................................ 3 1.3. Operation Frequency ............................................................................................ 3 2. Test Result Summary .............................................................................. 4 3. General Information ................................................................................. 5 3.1. Test environment and mode ................................................................................. 5 3.2. Description of Support Units ................................................................................ 5 4. Facilities and Accreditations .................................................................. 6 4.1. Facilities ................................................................................................................. 6 4.2. Location ................................................................................................................. 6 5. Measurement Uncertainty ....................................................................... 6 6. Test Results and Measurement Data ..................................................... 7 6.1. Antenna requirement ............................................................................................ 7 6.2. Conducted Emission ............................................................................................. 8 6.3. Conducted Output Power ................................................................................... 12 6.4. Emission Bandwidth ........................................................................................... 13 6.5. Power Spectral Density ....................................................................................... 14 6.6. Conducted Band Edge and Spurious Emission Measurement ....................... 15 6.7. Radiated Spurious Emission Measurement ...................................................... 17 Appendix A: Test Result of Conducted Test Appendix B: Photographs of Test Setup Appendix C: Photographs of EUT Report No.: TCT251201E034 Page 3 of 56 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. General Product Information 1.1. EUT description Product Name ....................... : Doorbell Camera Model/Type reference........... : U52 Sample Number....................: TCT251201E034-0101 Bluetooth Version ................ : V5.0 Operation Frequency ........... : 2402MHz~2480MHz Channel Separation .............. : 2MHz Data Rate ............................... : LE 1M PHY, LE 2M PHY Number of Channel .............. : 40 Modulation Type ................... : GFSK Antenna Type ........................ : Internal Antenna Antenna Gain ........................ : 2.99dBi Rating(s)................................ : Rechargeable Li-ion Battery DC 3.7V Note: The antenna gain listed in this report is provided by applicant, and the test laboratory is not responsible for this parameter. 1.2. Model(s) list No. Model No. Tested with 1 U52 Other models V52, K52, N52, X52, Z52 Note: U52 is tested model, other models are derivative models. The models are identical in circuit and PCB layout, different on the model names and color. So the test data of U52 can represent the remaining models. 1.3. Operation Frequency Channel Frequency Channel Frequency Channel Frequency Channel Frequency 0 2402MHz 10 2422MHz 20 2442MHz 30 2462MHz 1 2404MHz 11 2424MHz 21 2444MHz 31 2464MHz ... ... ... ... ... ... ... ... 8 2418MHz 18 2438MHz 28 2458MHz 38 2478MHz 9 2420MHz 19 2440MHz 29 2460MHz 39 2480MHz Remark: Channel 0, 19 & 39 have been tested. Report No.: TCT251201E034 Page 4 of 56 Hotline…

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Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID. ............................ : 2BR3K-DOORBELL-U52 Test Report No. ............... : TCT251201E035 Date of issue ................... : Dec. 10, 2025 Testing laboratory .......... : SHENZHEN TONGCE TESTING LAB Testing location/ address: 2101 & 2201, Zhenchang Factory, Renshan Industrial Zone, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, 518103, People's Republic of China Applicant's name ............ : HK EKO ELECTRONICS LIMITED Address ........................... : FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Manufacturer's name ... : HK EKO ELECTRONICS LIMITED Address ........................... : FLAT/RM 1 14/F HENLEY INDUSTRIAL CENTRE, 9-15 BUTE STREET, MONG KOK KL, HONGKONG, China Standard(s) ..................... : FCC CFR Title 47 Part 15 Subpart C Section 15.247 FCC KDB 558074 D01 15.247 Meas Guidance v05r02 ANSI C63.10:2020 Product Name ................. : Doorbell Camera Trade Mark ...................... : N/A Model/Type reference..... : U52, V52, K52, N52, X52, Z52 Rating(s).......................... : Rechargeable Li-ion Battery DC 3.7V Date of receipt of test item ......................................... : Dec. 01, 2025 Date (s) of performance of test ................................... : Dec. 01, 2025 ~ Dec. 10, 2025 Tested by (+signature) ... : Ronaldo LUO Check by (+signature) .... : Beryl ZHAO Approved by (+signature): Tomsin General disclaimer: This report shall not be reproduced except in full, without the written approval of SHENZHEN TONGCE TESTING LAB. This document may be altered or revised by SHENZHEN TONGCE TESTING LAB personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT251201E035 Page 2 of 74 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Table of Contents 1. General Product Information .................................................................. 3 1.1. EUT description ..................................................................................................... 3 1.2. Model(s) list ............................................................................................................ 3 1.3. Operation Frequency ............................................................................................ 4 2. Test Result Summary .............................................................................. 5 3. General Information ................................................................................. 6 3.1. Test environment and mode ................................................................................. 6 3.2. Description of Support Units ................................................................................ 7 4. Facilities and Accreditations .................................................................. 8 4.1. Facilities ................................................................................................................. 8 4.2. Location ................................................................................................................. 8 5. Measurement Uncertainty ....................................................................... 8 6. Test Results and Measurement Data ..................................................... 9 6.1. Antenna requirement ............................................................................................ 9 6.2. Conducted Emission ........................................................................................... 10 6.3. Maximum Conducted (Peak) Output Power ...................................................... 14 6.4. Emission Bandwidth ........................................................................................... 15 6.5. Power Spectral Density ....................................................................................... 16 6.6. Conducted Band Edge and Spurious Emission Measurement ....................... 17 6.7. Radiated Spurious Emission Measurement ...................................................... 19 Appendix A: Test Result of Conducted Test Appendix B: Photographs of Test Setup Appendix C: Photographs of EUT Report No.: TCT251201E035 Page 3 of 74 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. General Product Information 1.1. EUT description Product Name ....................... : Doorbell Camera Model/Type reference........... : U52 Sample Number....................: TCT251201E034-0101 Operation Frequency ........... : 2412MHz~2462MHz (802.11b/802.11g/802.11n(HT20)) Channel Separation .............. : 5MHz Number of Channel .............. : 11 for 802.11b/802.11g/802.11n(HT20) Modulation Technology ....... : 802.11b: Direct Sequence Spread Spectrum (DSSS) 802.11g/802.11n: Orthogonal Frequency Division Multiplexing (OFDM) Data speed ............................ : 802.11b: 1Mbps, 2Mbps, 5.5Mbps, 11Mbps 802.11g: 6Mbps, 9Mbps, 12Mbps, 18Mbps, 24Mbps, 36Mbps, 48Mbps, 54Mbps 802.11n: Up to 150Mbps Antenna Type ........................ : Internal Antenna Antenna Gain ........................ : 2.99dBi Rating(s)................................ : Rechargeable Li-ion Battery DC 3.7V Note: The antenna gain listed in this report is provided by applicant, and the test laboratory is not responsible for this parameter. 1.2. Model(s) list No. Model No. Tested with 1 U52 Other models V52, K52, N52, X52, Z52 Note: U52 is tested model, other models are derivative models. The models are identical in circuit and PCB layout, different on the model names and color. So the test data of U52 can represent the remaining models. Report No.: TCT251201E035 Page 4 of 74 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1.3. Operation Frequency For 802.11b/g/n(HT2…

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Report No.: TCT251201E034-A Page 1 of 2 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Appendix- Photographs of Test Setup Product: Doorbell Camera Model: U52 Radiated Emission Report No.: TCT251201E034-A Page 2 of 2 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Conducted Emission RF…

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