Item Type: Video Intercom Entry System Material: ABS Weight: Approx. 1100g/38.8oz Camera (Outdoor): Camera: 1/4 HD CMOS Light Source: 6 infrared lamps Resolution: 800x600 pixels Display (Indoor): Input Voltage: AC 100V to 240V Resolution: 800x480 Connection Mode: 4 wires Package List 1 x Indoor Unit 1 x Outdoor Unit 1 x Install Base 1 x Iron Sheet 3 x Connecting Lines 7 x Expansion Screws 8 x Metal Screws 1 x Specification 1 x Plug 1Professional Security Lens: High definition CMOS image sensor, automatic exposure and white balance control, highlight sensitive perspective. 2Visual Intercom: This wired door bell has a LCD monitor which allows you to monitor outside the door all the time, can prevent robbers and thieves. 3Built in Power Adapter: This door intercom is more space saving, more beautiful, environmentally friendly and low energy consumption, can save more electricity. 4One Key to Unlock and Call: This intercom entry system can control electronic lock, electromagnetic lock, electric lock, easy communication. 5Multiple Applications: Not only can be used at home, but also suitable for corporate, hotel apartments, factory bases, etc.