2A2TG-LXDBCMWIFI Chime

1 Foreword General This manual introduces the functions and operations of the WIFI Doorbell(Model：LXDB4I-WIFI) and WIFI Chime(Model: LXDBCM-WIFI). Read carefully before using the device, and keep the manual safe for future reference. About the Manual ● The manual is for reference only. ● The manual will be updated according to the latest laws and regulations of related jurisdictions. ● There might be errors in the print or deviations in the description of the functions, operations and technical data. If there is any doubt or dispute, we reserve the right of final explanation. ● All trademarks, registered trademarks and company names in the manual are properties of their respective owners. FCC Warning Federal Communication Commission Interference Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in 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 guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and receiver. • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. FCC Caution: This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Non-modification Statement: Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. FCC Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. 2 Important Safeguards and Warnings This section introduces content covering the proper handling of the WIFI Doorbell(Model： LXDB4I-WIFI), hazard prevention, and prevention of property damage. Read carefully before using the WIFI Doorbell(Model：LXDB4I-WIFI), and comply with the guidelines when using it. Installation Requirements ● Do not connect the power adapter to the WIFI Doorbell(Model：LXDB4I-WIFI) while the adapter is powered on. ● Strictly comply with the local electric safety code and standards. Make sure the ambient voltage is stable and meets the power supply requirements of the WIFI Doorbell(Model： LXDB4I-WIFI). ● Personnel working at heights must take all necessary measures to ensure personal safety including wearing a helmet and safety belts. ● Do not place the WIFI Doorbell(Model：LXDB4I-WIFI) in a place exposed to sunlight or near heat sources. ● Keep the WIFI Doorbell(Model：LXDB4I-WIFI) away from dampness, dust, and soot. ● Install the WIFI Doorbell(Model：LXDB4I-WIFI) on a stable surface to prevent it from falling. ● Install the WIFI Doorbell(Model：LXDB4I-WIFI) in a well-ventilated place, and do not block its ventilation. ● The power supply must conform to the requirements of ES1 in IEC 62368-1 standard and be no higher than PS2. Please note that the power supply requirements are subject to the WIFI Doorbell(Model：LXDB4I-WIFI) label. Operation Requirements ● Check whether the power supply is correct before use. ● Do not unplug the power cord on the side of the WIFI Doorbell(Model：LXDB4I-WIFI) while the adapter is powered on. ● Operate the WIFI Doorbell(Model：LXDB4I-WIFI) within the rated range of power input and output. ● Use the WIFI Doorbell(Model：LXDB4I-WIFI) under allowed humidity and temperature conditions. ● Do not drop or splash liquid onto the WIFI Doorbell(Model：LXDB4I-WIFI), and make sure that there is no object filled with liquid on the WIFI Doorbell(Model：LXDB4I-WIFI) to prevent liquid from flowing into it. ● Do not disassemble the WIFI Doorbell(Model：LXDB4I-WIFI) without professional instruction. ● This product is professional equipment. ● This equipment is not suitable for use in locations where children are likely to be present. 3 1. Adding Devices You can add a device by entering the device information manually (SN, IP), scanning the QR code, or performing an online search. 1 Adding by SN/QR Code You can add a device by scanning the QR code or by manually entering the SN. 1.1 Adding Wireless Devices This section provides instructions for adding WIFI Doorbell(Model ： LXDB4I-WIFI)s and WIFI Chime(Model: LXDBCM-WIFI). Procedure Step 1 On the Device screen, tap , then select SN/Scan. Step 2 Add a device using one of the following methods: ● Scan the device QR code directly, or tap to import a QR code picture, then tap Next. ● Tap Manual, enter the device SN, then tap Next. Figure 1-1 Add a device Step 3 Ensure the device is powered on and the indicator light is flashing blue or green, then tap Next. If you are re-adding the device, skip steps 4–6 and start from step 7. Step 4 (Optional) Find devices via Bluetooth. 1) Tap Settings to turn on your phone's Bluetooth. 2) Tap Enable permissions to allow Bluetooth permissions for the App. 4 3) Tap Next on the Add Device Screen. Pairing will begin automatically. Figure 1-2 Find devices via Bluetooth Step 5 On the Add Device screen, enter the device password and your email address, then tap Next. Figure 1-3 Set device pass…

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(LT Security Inc) (Jan. 26, 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: 2A2TG-LXDBCM) [LT Security Inc] (“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) Kevin Lin (LT Security Inc) (Jan. 26, 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: 2A2TG-LXDBCM) [LT Security Inc] (“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) Kevin Lin

Attestation Statements (Jan. 26, 2026) TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA RE: Attestation Statements Part 2.911(d)(7) request for (FCC ID: 2A2TG-LXDBCM) (LT Security Inc), the undersigned, hereby authorize (LT Security Inc) to act as our designated U.S. agent for service of process, (LT Security Inc) accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. (LT Security Inc) accepts the responsibility to act as designated U.S. agent for service of process. Applicant Information： Company name: LT Security Inc Product Description: WIFI Chime FRN: 0031239015 Grantee code: 2A2TG FCC ID: 2A2TG-LXDBCM Contact Name: Kevin Lin Address: 17333 Freedom Way,City of Industry,California,United States,91748 Telephone No: 626-435-2838 Email: [email protected] U.S. Agent Information: Company Name: LT Security Inc Address: 17333 Freedom Way,City of Industry,California,United States,91748 City/Province/Zip: 91748 FRN: 0031239015 Contact Name: Kevin Lin Telephone No: 626-435-2838 Email: [email protected] Signature [Name]

LT Security Inc (Jan. 26, 2026) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (WIFI Chime / Model: LXDBCM-WIFI / FCC ID: 2A2TG-LXDBCM) 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 (Block diagram, Operational description, Schematics) required to be submitted with this application be permanently withheld from public review. These documents contain detailed system and equipment description and related information about the product which LT Security Inc considers to be proprietary, confidential and a custom design and otherwise would not release to the general public. Since the design is a basis from which future technological products will evolve, LT Security Inc considers that this information would be of benefit to its competitors and that the disclosure of the information in these documents would give competitors an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Name: Kevin Lin Title: Manager Signature of applicant:

LT Security Inc (Jan. 26, 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 (Cerpass technology corporation Test Laboratory) 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, Name: Kevin Lin Title: Manager Signature of applicant:

CERPASS TECHNOLOGY CORP. Report No.: 25120474 CERPASS TECHNOLOGY CORP. Issued date : Jan. 15, 2026 Page No. : 1 of 4 EXTERNAL PHOTOGRAPHS OF EUT 1) EUT Photo 2) EUT Photo CERPASS TECHNOLOGY CORP. Report No.: 25120474 CERPASS TECHNOLOGY CORP. Issued date : Jan. 15, 2026 Page No. : 2 of 4 3) EUT Photo 4) EUT Photo CERPASS TECHNOLOGY CORP. Report No.: 25120474 CERPASS TECHNOLOGY CORP. Issued date : Jan. 15, 2026 Page No. : 3 of 4 5) EUT Photo 6) EUT Photo CERPASS TECHNOLOGY CORP. Report No.: 25120474 CERPASS TECHNOLOGY CORP. Issued date : Jan. 15, 2026 Page No. : 4 of 4 7) EUT Photo

Label Location

CERPASS TECHNOLOGY CORP. Report No.: 25120474 CERPASS TECHNOLOGY CORP. Issued date : Jan. 15, 2026 Page No. : 1 of 5 INTERNAL PHOTOGRAPHS OF EUT 1) EUT Photo 2) EUT Photo Antenna CERPASS TECHNOLOGY CORP. Report No.: 25120474 CERPASS TECHNOLOGY CORP. Issued date : Jan. 15, 2026 Page No. : 2 of 5 3) EUT Photo 4) EUT Photo CERPASS TECHNOLOGY CORP. Report No.: 25120474 CERPASS TECHNOLOGY CORP. Issued date : Jan. 15, 2026 Page No. : 3 of 5 5) EUT Photo 6) EUT Photo CERPASS TECHNOLOGY CORP. Report No.: 25120474 CERPASS TECHNOLOGY CORP. Issued date : Jan. 15, 2026 Page No. : 4 of 5 7) EUT Photo 8) EUT Photo RF Chip CERPASS TECHNOLOGY CORP. Report No.: 25120474 CERPASS TECHNOLOGY CORP. Issued date : Jan. 15, 2026 Page No. : 5 of 5 9) EUT Photo

CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC03 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-523-0 V1.1 Page No. : 1 of 10 FCC ID : 2A2TG-LXDBCM Radio Frequency Exposure Applicant : LT Security Inc Address : 17333 Freedom Way,City of Industry,California,United States,91748 Equipment : WiFi chime Model No. : LXDBCM-WIFI Trade Name : N/A FCC ID : 2A2TG-LXDBCM I HEREBY CERTIFY THAT: The sample was received Dec. 25, 2025 and the testing was completed on Jan. 10, 2026 at Cerpass Technology Corp. The test result refers exclusively to the test presented test model / sample. Without written approval of Cerpass Technology Corp., the test report shall not be reproduced except in full. Approved by: Mark Liao / Supervisor Laboratory Accreditation: Cerpass Technology Corporation Test Laboratory CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC03 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-523-0 V1.1 Page No. : 2 of 10 FCC ID : 2A2TG-LXDBCM Contents 1. Summary of Test Procedure and Test Results ........................................................................................ 4 1.1 Applicable Standards ................................................................................................................................ 4 2. Test Configuration of Equipment under Test ........................................................................................... 5 2.1 Feature of Equipment ............................................................................................................................... 5 2.2 General Information of Test ....................................................................................................................... 6 2.3 Measurement Uncertainty ......................................................................................................................... 7 3. Test Equipment and Ancillaries Used for Tests ....................................................................................... 8 4. Radio Frequency Exposure ....................................................................................................................... 9 CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC03 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-523-0 V1.1 Page No. : 3 of 10 FCC ID : 2A2TG-LXDBCM History of this test report Report No Issued Date Description 25120474-TRDFCC03 Jan. 15, 2026 Initial Issue CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC03 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-523-0 V1.1 Page No. : 4 of 10 FCC ID : 2A2TG-LXDBCM 1. Summary of Test Procedure and Test Results 1.1 Applicable Standards FCC Rules and Regulations Part 2.1091 FCC Rule . Description of Test Result 2.1091 . Radio Frequency Exposure PASS *The lab has reduced the uncertainty risk factor from test equipment, environment and staff technicians which according to the standard on contract. Therefore, the test result will only be determined by standard requirement, measurement uncertainty evaluation is not considered. CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC03 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-523-0 V1.1 Page No. : 5 of 10 FCC ID : 2A2TG-LXDBCM 2. Test Configuration of Equipment under Test 2.1 Feature of Equipment Equipment WiFi chime Model Name LXDBCM-WIFI Model Discrepancy N/A Frequency Range BLE/ WIFI 2.4G: 2400MHz-2483.5MHz Modulation Type BLE: GFSK 2.4GHz 802.11b: CCK, DQPSK, DBPSK 802.11g/n: BPSK, QPSK, 16QAM, 64QAM 802.11ax: BPSK, QPSK, 16QAM, 64QAM, 256QAM, 1024QAM Data Rate BLE: GFSK: 1Mbps WIFI 2.4GHz: 802.11b: 1, 2 ,5.5,11Mbps 802.11g: 6,9,12,18,24,36,48,54Mbps 802.11n: MCS0-MCS7, HT20 802.11ax: MCS0-MCS11, HE20 EUT Power Rating: 100-240VAC/0.5A; 50/60Hz Note: For more details, please refer to the User’s manual of the EUT. CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC03 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-523-0 V1.1 Page No. : 6 of 10 FCC ID : 2A2TG-LXDBCM 2.2 General Information of Test Organization Cerpass Technology Corp. Test Site Cerpass Technology Corporation Test Laboratory Address: No.10, Ln. 2, Lianfu St., Luzhu Dist., Taoyuan City 33848, Taiwan (R.O.C.) Tel:+886-3-3226-888 Fax:+886-3-3226-881 FCC TW1439, TW1079 IC 4934E-1, 4934E-2 Frequency Range Investigated: Conducted: from 150kHz to 30 MHz Radiation: from 9kHz to 25,000MHz Test Distance: The test distance of radiated emission from antenna to EUT is 3 M. CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC03 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-523-0 V1.1 Page No. : 7 of 10 FCC ID : 2A2TG-LXDBCM 2.3 Measurement Uncertainty ISO/IEC 17025 requires that an estimate of the measurement uncertainties associated with the emissions test results be included in the report. The measurement uncertainties given below are based on a 95% confidence level (based on a coverage factor (k=2). Measurement Item Uncertainty AC Power Line Conduction(150kHz~30MHz) ±3.2dB Radiated Spurious Emission(9kHz~30MHz) ±3.4dB Radiated Spurious Emission(30MHz~1GHz) ±5.2dB Radiated Spurious Emission(1GHz~25GHz) ±5.2dB Conducted Spurious Emission ±2.1dB 6dB Bandwidth ±4.4% 20dB Bandwidth ±4.5% Occupied Bandwidth ±4.4% Peak Output Power(Conducted Power Meter) ±1.1dB Dwell Time / Deactivation Time ±3.5% Power Spectral Density ±2.0dB Duty Cycle ±3.5% CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC03 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-523-0 V1.1 Page No. : 8 of 10 FCC ID : 2A2TG-LXDBCM 3. Test Equipment and Ancillaries Used for Tests Test Item RF Conducted Test Site RFCON01-NK Instrument Manufacturer Model No Serial No Calibration Date Valid Date EXA Signal Analyzer KEYSIGHT N9010A MY54200207 2025/04/23 2026/04/22 Attenuator KEYSIGHT 8491B MY39250703 2025/02/12 2026/02/11 Power Meter Anritsu ML2495A 1224005 2025/02/12 2026/02/11 Power Sensor Anritsu MA2411B 1207295 2025/02/12 2026/02/11 CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC03 Cer…

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Dongguan UANT Electronics Co., Ltd. Specification Address: Room 101, Building 2, No. 9, Xinfa Road, Tangxia Town, Dongguan City, Guangdong, PRC Tel: +86-0769-81777126 Email: [email protected] ➢ Antenna technical parameters Model UB01C45F1D5563A Type FPC Frequency range 2.4G/5.8G Appearance FPC+ Aerial feeder Efficiency 49.11%@2.4G；63.47%@5.8G Gain (dBi) [email protected]；[email protected] Direction Omnidirectional antenna Connect type IPEX Antenna size 34.8*13.2*0.2mm Feeder specification 1.13 line Feeder Loss 0.5dB·m-1@1GHz，1dB·m-1@3GHz， 3dB·m-1@6GHz RL (return loss) ＜-10dB Characteristic impedance 50Ω Storage temperature -20~70°C Working temperature -20~70°C Capacity / IP rate / Withstand voltage 500V ➢ Product 2D drawing ➢ IPEX connector specification ➢ Connector structure diagram ➢ Behaviour of electricity ➢ Metal Layout ➢ Product 2D drawing ➢ Coaxial-cable electrical performance parameters Capacitance (pF/m) 95.6 Impedance (ohm) 50 Transmission rate (%) 70 Working frequency (GHz) 6.0 Max working voltage(Vrms) 1000 ➢ Attenuation Frequency (GHz) Attenuation (dB/m) 1.0 2.3 2.0 3.1 3.0 3.9 4.0 4.6 5.0 5.1 6.0 5.8 ➢ Testing equipment list Device name Manufacturer Model# Series Number Network Analyzer Agilent E5071C MY46315996 Radio Communication Tester ROHDE&SCHWARZ CMW500 0002K50-100844 ➢ Test configuration diagram ➢ Device positon ➢ Testing result and graphics (Return loss vs. VSWR) ➢ Efficiency Frequency / MHz Efficiency / dB Efficiency / % Gain/ dBi 2400 -3.01 50 2.31 2410 -3.2 47.86 2.33 2420 -2.77 52.84 2.66 2430 -3.2 47.86 2.59 2440 -3 50.12 2.34 2450 -3.13 48.64 2.58 2460 -3.15 48.42 2.11 2470 -3.09 49.09 2.34 2480 -3.15 48.46 1.46 2490 -3.26 47.21 1.64 2500 -3.04 49.71 1.41 5150 -2.61 54.83 4.3 5200 -2.94 50.82 3.64 5250 2.6 54.95 3.61 5300 -2.35 58.21 3.48 5350 -1.65 68.39 4.29 5400 -1.98 63.39 3.92 5450 -1.93 64.12 3.44 5500 -1.69 67.76 3.6 5550 -1.96 63.68 3.01 5600 -1.95 63.83 3.13 5650 -1.64 68.55 3.75 5700 -1.7 67.61 3.8 5750 -1.56 69.82 3.9 5800 -1.87 65.01 3.66 5850 -1.48 71.12 4.48 ➢ 2D Direction Phi 0 Phi 90 Theta 90 ➢ 3D Direction

CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC02 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-509-0 Ver 1.7 Page No. : 1 of 64 FCC ID. : 2A2TG-LXDBCM FCC RADIO TEST REPORT Applicant : LT Security Inc Address : 17333 Freedom Way,City of Industry,California,United States,91748 Equipment : WIFI chime Model No. : LXDBCM-WIFI Trade Name : N/A FCC ID : 2A2TG-LXDBCM I HEREBY CERTIFY THAT : The sample was received on Dec. 25, 2025 and the testing was completed on Jan. 10, 2026 at Cerpass Technology Corp. The test result refers exclusively to the test presented test model / sample. Without written approval of Cerpass Technology Corp., the test report shall not be reproduced except in full. Approved by: Mark Liao / Supervisor Laboratory Accreditation: Cerpass Technology Corporation Test Laboratory CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC02 Cerpass Technology Corp. Issued date : Jan. 15, 2026 T-FD-509-0 Ver 1.7 Page No. : 2 of 64 FCC ID. : 2A2TG-LXDBCM Contents 1. Summary of Test Procedure and Test Results ................................................................................ 5 1.1 Applicable Standards ................................................................................................................. 5 2. Test Configuration of Equipment under Test ................................................................................... 6 2.1 Feature of Equipment ................................................................................................................. 6 2.2 Carrier Frequency of Channels .................................................................................................. 7 2.3 Test Mode and Test Software ..................................................................................................... 8 2.4 Description of Test System ......................................................................................................... 9 2.5 General Information of Test ...................................................................................................... 10 2.6 Measurement Uncertainty ........................................................................................................ 11 3. Test Equipment and Ancillaries Used for Tests ............................................................................. 12 4. Antenna Requirements ..................................................................................................................... 13 4.1 Antenna Construction and Directional Gain ............................................................................. 13 5. Test of AC Power Line Conducted Emission ................................................................................. 14 5.1 Test Limit .................................................................................................................................. 14 5.2 Test Procedures ....................................................................................................................... 14 5.3 Typical Test Setup .................................................................................................................... 15 5.4 Test Result and Data ................................................................................................................ 16 5.5 Test Photographs ..................................................................................................................... 18 6. Test of Radiated Spurious Emission ............................................................................................... 19 6.1 Test Limit .................................................................................................................................. 19 6.2 Test Procedures ....................................................................................................................... 20 6.3 Typical Test Setup .................................................................................................................... 21 6.4 Test Result and Data (9KHz ~ 30MHz) .................................................................................... 22 6.5 Test Result and Data (30MHz ~ 1GHz) ................................................................................... 22 6.6 Test Result and Data (1GHz ~ 25GHz) .................................................................................... 24 6.7 Restricted Bands of Operation ................................................................................................. 42 6.8 Test Photographs (30MHz ~ 1GHz) ......................................................................................... 43 6.9 Test Photographs (1GHz ~ 25GHz) ......................................................................................... 44 7. Test of Conducted Spurious Emission ........................................................................................... 46 7.1 Test Limit .................................................................................................................................. 46 7.2 Test Procedure ......................................................................................................................... 46 7.3 Test Setup Layout .................................................................................................................... 46 7.4 Test Result and Data ................................................................................................................ 46 8. On Time, Duty Cycle and Measurement methods ......................................................................... 53 8.1 Test Limit .................................................................................................................................. 53 8.2 Test Procedure ......................................................................................................................... 53 8.3 Test Setup Layout ...............................…

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CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC01 Cerpass Technology Corp. Issued Date : Jan. 15, 2026 T-FD-506-0 V1.8 Page No. : 1 of 41 FCC ID : 2A2TG-LXDBCM FCC RADIO TEST REPORT Applicant : LT Security Inc Address : 17333 Freedom Way, City of Industry, California, United States,91748 Equipment : WIFI Chime Model No. : LXDBCM-WIFI Trade Name : N/A FCC ID : 2A2TG-LXDBCM I HEREBY CERTIFY THAT: The sample was received on Dec. 25, 2025 and the testing was completed on Jan. 10, 2026 at Cerpass Technology Corp. The test result refers exclusively to the test presented test model / sample. Without written approval of Cerpass Technology Corp., the test report shall not be reproduced except in full. Approved by: Mark Liao / Supervisor Laboratory Accreditation: Cerpass Technology Corporation Test Laboratory CERPASS TECHNOLOGY CORP. Report No.: 25120474-TRDFCC01 Cerpass Technology Corp. Issued Date : Jan. 15, 2026 T-FD-506-0 V1.8 Page No. : 2 of 41 FCC ID : 2A2TG-LXDBCM Contents 1. Summary of Test Procedure and Test Results ................................................................................ 5 1.1 Applicable Standards ................................................................................................................. 5 2. Test Configuration of Equipment under Test ................................................................................... 6 2.1 Feature of Equipment ................................................................................................................. 6 2.2 Carrier Frequency of Channels .................................................................................................. 7 2.3 Test Mode and Test Software ..................................................................................................... 8 2.4 Description of Test System ......................................................................................................... 9 2.5 General Information of Test ...................................................................................................... 10 2.6 Measurement Uncertainty ........................................................................................................ 10 3. Test Equipment and Ancillaries Used for Tests ............................................................................. 11 4. Antenna Requirements ..................................................................................................................... 12 4.1 Standard Applicable ................................................................................................................. 12 4.2 Antenna Construction and Directional Gain ............................................................................. 12 5. Test of Conducted Emission ............................................................................................................ 13 5.1 Test Limit .................................................................................................................................. 13 5.2 Test Procedures ....................................................................................................................... 13 5.3 Typical Test Setup .................................................................................................................... 14 5.4 Test Result and Data ................................................................................................................ 15 5.5 Test Photographs ..................................................................................................................... 17 6. Test of Spurious Emission (Radiated) ............................................................................................ 18 6.1 Test Limit .................................................................................................................................. 18 6.2 Test Procedures ....................................................................................................................... 19 6.3 Typical Test Setup ..............................................................................…

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