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.1 x Indoor Unit 1 x Outdoor Unit1 x Install Base1 x Iron Sheet3 x Connecting Lines7 x Expansion Screws8 x Metal Screws1 x Specification1 x Plug