【Wired Video Intercom System】The wired video doorbell system activates the indoor monitor when someone presses the doorbell, You can talk with anyone who is outside your door through the indoor monitor and press the "Unlock" button to open the door. This system uses 4 wires to connect the doorbell and monitor..【One Button Monitoring, Video Intercom】The One-click Monitoring feature allows you to actively view the situation outside your door, even if nobody rings the doorbell. This system can be extended to include up to 4 monitors, and allows for two-way voice communication between the monitor and doorbell, as well as between monitors..【7-Inch Color LCD Monitor】The 7-inch screen provides a clear field of view. It supports call, talk, monitor, intercom, and unlock functions. The hands-free feature ensures clear voice and good sound quality. There are 7 chord melody ringtones to choose from, and the volume, brightness, and contrast can be adjusted. The ABS screen shell has an anti-fingerprint process and a silver mirror decorative strip, making it aesthetically pleasing..【Full Aluminum Alloy Doorbell】This aluminum alloy door camera has a rain cover design, is IP65 waterproof, dust-proof, and anti-vandal. It has built-in speakers and microphone for two-way audio, with adjustable volume levels. The 6-LED automatic switching allows for night vision, allowing you to clearly observe visitors day and night. It can connect to all 12V electronic locks..【Easy Installation】Having this video door phone system, you won't need to always go downstairs or to the fence gate to open the door. This doorbell system applies to home, apartments, villas, hotels, offices, and public buildings. We'll provide an adapter, 4-wire terminal, and screws materials. The video intercom works with RVV4 wire (ASIN: B07PJRHPQ2), Power Supply Control (ASIN: B06XRVMGDN), Electronic Locks (ASIN: B01GFTP3LK, B08CKDJ67T, B08CSJ3JC1).