Feature:1. 2wire system, only needs two wires, the power, audio, video and control signals are all transmitted through the 2wire nonpolar central power supply.2. Use plugin connectors and DIP switches for quick installation. The integrated multifunction and simple operation make the system more attractive.3. Flexible cable connection, support in and out, branch and mixed mode. Support intercom communication between indoor units. Aluminum alloy outdoor unit, rainproof, antioxidation and durable.4. Using the integrated power supply, it supports up to 2 outdoor cameras and 6 indoor monitors (including only 1 camera and 3 monitors).5. The camera has a builtin white light LED night vision device that supports night vision effects. The monitor adopts 7in color TFT LCD, no radiation, low power consumption and high definition. The volume, brightness and contrast are adjustable.6. Two locks can be unlocked at the same time. Support handsfree intercom, mute indoor intercom function, group call/intercom function.Specification:Item Type: Video Door PhoneMaterial: Aluminum Alloy + ABS PlasticOutdoor Camera:Aluminum alloy external device with white LED night vision gogglesCamera: 1/3in CMOS 1000TV lineViewing Angle: 92Minimum Illumination: 0.5LuxVideo Output: 1Vp-p /75Connection Method: BUS 2-wireInstallation Method: Wall-mountedWorking Temperature: -30 to 50Size: Approx. 240 x 169 x 24mm/9.4 x 6.7 x 0.9inMonitor:Screen: 7-inch LCDEffective 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. Connect the indoor unit, outdoor unit and power supply with cables, and the power cord is connected to electricity2. Adjust the color and brightness of the display, and use the intercom function of the doorbell3. Connect the electronic lock at home to unlock the doorbell.Package List:1 x Outdoor Camera3 x Indoor Monitor1 x DC24V 2.5A Power Supply1 x 4 Core Terminal Wire2 x 2 Core Connection Terminal Wire3 x 2 Hole Terminal1 x 3 Hole Terminal1 x 4 Hole Terminal3 x Bracket1 x Screws Pack1 x User Manual