AMOCAM 7" LCD Monitor Video Intercom Doorbell 1- Camera 3- monitor System This System includes 1 outdoor color camera with 3 pcs of 7 inch color LCD screen,Support night vision. Indoor Monitor: Display: 7 inch TFT LCD screen (16:9 displays). Resolution: 800 X 480. Input: AC 100-240V 50Hz-60Hz.  Output: DC 15V/1500 mA.  Case: Plastic Material. Mounting: Surface Mounted. Outdoor Camera: Camera: 1/3 CMOS. Camera resolution:700 line. Illumination: 0 Lux. Night vision illumination distance:1 meter. Power Adapter: Shared indoor unit. Viewing angle: 92 degrees. Case: ABS/Aluminum. Installation: Surface Mounting. Packing includes: 1 x Outdoor Camera.  3 x Indoor Monitor.  3 x Hanging plate.  3 x Power Adapter.  3 x 4-core/5-core connection cable.  1 x 2-core connection cable.  1 x bags Screws.  1 x Manual. Note:Electric bolt lock, Electric strike,Electric magnetic lock,need extra "Power Supply Control" connecting the lock. Please search: "AMOCAM Power Supply" for Dedicated Power Supply Control. Dual-way intercom answering, monitoring and unlock Doorbell system provides a securely and conveniently solution for you When someone press the call button on outdoor unit, it will active the indoor monitor, monitor will turn on, ring and show the video outside. So you can see who is outside, Then you can press the"intercom" button on monitor to talk with the people outside, unlock the lock and press the "intercom" button again to end the conversion. This 2-way communication is an inexpensive and effective way to talk with the stranger at the door without actually opening the door. Multifunctional solutions Feature: This Video Door phone System available up to 6 indoor Monitor and 3 outdoor cameras at most,support room to room intercom. 7 inch color LCD screen for Clear night-viewing, 24 hours monitoring, calling, speaking and unlocking remote controlling etc. Hand-free intercom communication,Brightness, Chroma, and Volume adjustable,16-chord melody ring for option. 24/7 Day / Night cameras Each with a 92 Degree viewing angle. Built in 6pcs IR-LED night vision. At night or at low light status, the 6 led lights will turn on automatically and allows you can still see image at night. At daytime, the 4 led lights will not turn on. All-Season Weatherproof Cameras Aluminum housing that can withstand outdoor conditions. Provides both durability and clear images no matter the weather or time of day or night.  EASY INSTALLATION Surface mounted,both of the outdoor unit and indoor unit have plug-and-play connector. wired connection stability clear vision for home security. It is a great system for home intercom and security.