Feature: 1. 7in high‑definition color TFT LCD monitor, no radiation, low power consumption. The volume, brightness and contrast can be adjusted. Support dual intercom communication between indoor units. 2. Premium aluminum alloy outdoor unit, rain‑proof, anti‑oxidation and durable. The camera has a built‑in white light LED night vision device, which has clear night vision. 3. 2‑wire system, the power, audio, video and control signals are all transmitted through the 2‑wire non‑polar central power supply. 4. Using the integrated power supply, it supports up to 2 outdoor cameras and 6 indoor monitors (include only 1 camera and 2 monitors). 5. Use plug‑in connectors and DIP switcher for quick installation. Flexible cable connection supports in and out, branch and mixed modes. 6. Two locks can be unlocked at the same time. Support hands‑free intercom, mute room intercom function and group call/intercom function. Specification: Item Type: Video Doorbell Material: Aluminum Alloy + ABS Plastic Outdoor Camera: Aluminum alloy external device with white LED night vision lens Camera: 1/3in CMOS 1000TV line Viewing Angle: 92° Minimum Illumination: 0.5Lux Video Output: 1Vp-p /75Ω Connection Method: BUS 2-wire Installation Method: Wall-mounted Working Temperature: -30℃ to 50℃ Size: Approx. 240 x 169 x 24mm/9.4 x 6.7 x 0.9in Monitor: Screen: 7-inch LCD 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. Connect the indoor unit, outdoor unit and power supply with cables, and the power cord is connected to electricity 2. Adjust the color and brightness of the display, and use the intercom function of the doorbell 3. Connect the electronic lock at home to unlock the doorbell. Package List: 1 x Outdoor Camera2 x Indoor Monitor1 x DC24V 2.5A Power Supply1 x 4 Core Terminal Wire3 x 2 Core Connection Terminal Wire2 x 2 Hole Terminal1 x 3 Hole Terminal1 x 4 Hole Terminal2 x Bracket1 x Screws Pack1 x User Manual