Feature: 1. High Definition Monitor: Ultra thin indoor monitor, high definition, its ringtone volume, call volume, brightness and color are adjustable. 2. Outdoor Camera: The camera has white light LED night vision. With rain cover, weatherproof, moisture proof and oxidation proof. And it use BUS 2 wire connection. 3. Stainless Steel Electric Control Lock: The lock is rustproof and durable. Support electric control, key and manual unlocking, effective anti theft. 4. Multiple Functions: The video doorbell kit has functions of monitoring, calling, unlocking, do not disturb, and group calling, which brings you a lot of convenience. 5. Built In BUS Power Supply: Built in BUS power supply, AC 100‑240V input voltage, DC 24V 2.5A output voltage, stable and reliable. Specification: Item Type: Video Doorbell Material: Aluminum Alloy, ABS, Stainless Steel Uses: Can be used for apartment, villa, hotel, office, public building video doorbell Outdoor Camera Parameters: Wire System: BUS 2 wire Camera: CVBS 1000TVL LED: White light LED Power: Standby 0.1W Effective Distance: 100m (2 x 0.75mm²) Angle: 92° Working Temperature: -20-+60℃ Indoor Monitor Parameters: Wire System: BUS 2 wire Screen Resolution: 1024x600 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 100-240V Output Voltage: DC24V 2.5A. Package List: 1 x Outdoor Camera 3 x Monitor1 x Bus Power 1 x 2p Terminal Line8 x Screw8 x Expansion Tube3 x Monitor Bracket3 x Monitor Hanging Board1 x 4P Terminal1 x 3P Terminal3 x 2P Terminal1 x Manual 13 x Lock Screw2 x Lock Piece3 x Key1 x Cylinder1 x Lock Body1 x Lock Shell1 x Switch Note: 1. The machine should be placed in a sturdy, well‑ventilated, dry, and free place. Avoid direct sunlight, no strong magnetic field and dust.2. Do not use chemicals to clean the surface; it can be cleaned with a soft dry cloth.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.