1、2‑wire system, power, audio, video and control signals, all signals are transmitted through 2‑wire non‑polarity central power supply. 2、Use plug‑in connectors and DIP switches for quick installation. Support flexible cable connection, support in and out, branch and mixed mode. 3、Camera with built‑in white LED night vision device, has good night‑vision 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 multi‑function and simple operation make the system more attractive. Support two‑way hands‑free intercom between indoor units. 8、Aluminum alloy outdoor unit, rain‑proof and waterproof, effective against oxidation, can well monitor the outside of the door. Item Type: Video Door Phone Material: Aluminum Alloy +ABS PlasticOutdoor Camera Specifications: Aluminum alloy external device with white LED night vision camera Camera: 1/3in CMOS 1000TV line Viewing Angle: 92° Minimum Illumination: 0.5Lx Video Output: 1Vp-P /75Ω Connection Method: BUS 2-Wire Installation Method: Wall-Mounted Working Temperature: -30°C-50°C Size: Approx. 240 x 169 x 24mm/9.4 x 6.7 x 0.9in Monitor Specifications: Screen: 7in LCD Screen Effective Pixels: 1024 x 600 Connection Method: BUS 2-Wire Size: Approx. 151 x 80 x 38mm/5.9 x 3.1 x 1.5in How 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. 1 x Outdoor Unit (Camera) 1 x Indoor Unit (Monitor) 1 x DC24V 2.5A Power Supply 1 x 4 Core Connection Terminal Wire 3 x 2 Core Connecting Terminal Line 1 x 2 Hole Terminal 1 x 3 Hole Terminal 1 x 4 Hole Terminal 1 x Bracket 1 x Screw Pack 1 x User Manual