Feature:1. 2wire system, power, audio, video and control signals, all signals are transmitted through 2wire nonpolarity central power supply.2. Use plugin connectors and DIP switches for quick installation. Support flexible cable connection, support in and out, branch and mixed mode.3. Camera with builtin white LED night vision device, has good nightvision effect, minimum illumination is 0.5lx.4. Powered by an integrated power supply, support up to 2 outdoor units and 6 indoor monitors (only 1pc monitor and 1pc camera includes).5. Adjustable volume, brightness and contrast, can unlock 2 locks at the same time, and the indoor intercom function can be set to mute.6. The monitor adopts 7in color TFT LCD, no radiation, low power consumption, 1024 x 600 high definition.7. The integrated multifunction and simple operation make the system more attractive. Support twoway handsfree intercom between indoor units.8. Aluminum alloy outdoor unit, rainproof and waterproof, effective against oxidation, can well monitor the outside of the door.Specification:Item Type: Video Door PhoneMaterial: Aluminum Alloy +ABS PlasticOutdoor Camera Specifications:Aluminum alloy external device with white LED night vision cameraCamera: 1/3in CMOS 1000TV lineViewing Angle: 92Minimum Illumination: 0.5LxVideo Output: 1Vp-P /75Connection Method: BUS 2-WireInstallation Method: Wall-MountedWorking Temperature: -30C-50CSize: Approx. 240 x 169 x 24mm/9.4 x 6.7 x 0.9inMonitor Specifications:Screen: 7in LCD ScreenEffective Pixels: 1024 x 600Connection Method: BUS 2-WireSize: Approx. 151 x 80 x 38mm/5.9 x 3.1 x 1.5inHow to Use:1. The indoor unit, outdoor unit, and power supply are connected by cables, and the power cord is connected to power supply.2. Adjust the color and brightness of the display, and ensure the doorbell's intercom function can be used.3. Connect to the electronic lock at home, can realize doorbell unlock..Package List:1 x Outdoor Unit (Camera)1 x Indoor Unit (Monitor)1 x DC24V 2.5A Power Supply1 x 4 Core Connection Terminal Wire3 x 2 Core Connecting Terminal Line1 x 2 Hole Terminal1 x 3 Hole Terminal1 x 4 Hole Terminal1 x Bracket1 x Screw Pack1 x User Manual