Feature: 1. Multifunctional: The doorbell has functions of monitoring, calling, unlocking, do not disturb, and group calling. 2. Adjustable: The monitor's ringtone volume, call volume, brightness and color are adjustable. 3. BUS 2 Wire: The outdoor unit uses BUS two‑wire system connection, built‑in BUS power supply, easy to install. 4. HD Display: The doorbell adopts ultra‑thin design, high‑definition color indoor display, 1024 x 600 screen resolution. 5. Night Vision: Outdoor unit with white light LED night vision function, provide clear images of visitors even in the darkness of night. 6. Weatherproof: Outdoor unit with rain cover, weatherproof, moisture‑proof and oxidation‑proof. 7. Wide Application: The video doorbell can be used in apartments, villas, hotels, offices, public buildings, etc. Specification: Item Type: Video intercom doorbell Screen Size: 7in Material: Aluminum Alloy/ABS Uses: Can be used for apartment, villa, hotel, office, public building video doorbell Outdoor Unit Parameters: Wire System: BUS 2-wire Camera: CVBS 1000TVL LED: White light LED Power: Standby 0.1W Effective Distance: Approx. 100m/109.36yd (2 x 0.75mm²) Angle: 92° Working Temperature: -20-+60℃ Indoor Monitor Parameters: Wire System: BUS 2-wire Screen Resolution: 1024 x 600 Effective Area: 154.08(H) x86.58(V) 7in Power Consumption: Standby 0.5W Call Delay: 120s±10% Monitoring Delay: 60s±10% Working Temperature: -20-+60℃ BUS Power Supply Parameters: Input Voltage: AC 100-240VAC Output Voltage: DC24V/2.5A. Package List: 1 x Outdoor Unit4 x Screen1 x BUS Power1 x 2p Terminal Line8 x Screw8 x Expansion Tube4 x Screen Stand4 x Screen Hanging Board1 x 4p Terminal1 x 3p Terminal4 x 2p Terminal1 x Manual Note: (1) The machine should be placed in a sturdy, well‑ventilated, dry place, without direct sunlight, strong magnetic field and dust;(2) Do not use chemicals to clean the surface; you can use a clean, soft dry cloth to clean;(3) Avoid pressing multiple keys at the same time;(4) The outdoor unit and indoor unit must be used in conjunction with the designated model, and must not be mixed with other models or products of other companies.