Smartlife 7 Inches Digital HD Wired Doorbell Camera Video Intercom Door Phone System Wide Angle Peephole Viewer It is wired doorbell.Aluminum alloy panel of indoor unit, fashionable and luxury, Outdoor unit is oxidation-proof with durable aluminum alloy 7 inches color TFT LCD without radiation, low power consumption and high definition IR Camera with night vision, Electric lock-control function Hand-free intercom, Mute indoor intercom function, Monitoring the outside of the door Volume, brightness and contrast are adjustable, Easy installation by yourself with adapter and cable we provide in this kit