Aluminum alloy outdoor unit, rainproof, anti‑oxidation and durable. With white light LED night vision device, excellent night vision effect 2 locks can be unlocked at the same time. Support hands‑free intercom, with mute indoor intercom function and group call/intercom function 2‑wire system requires only two wires, the power supply, audio, video and control signals are all transmitted through the 2‑wire non‑polar central power supply 7in color TFT LCD display, no radiation, low power consumption and high definition. Adjustable volume, brightness and contrast. Support dual intercom communication between indoor monitors With plug‑in connectors and DIP switcher, fast to install. Flexible cable connection, support in and out, branch and mixed mode