OBO HANDS 7 Inch TFT LCD Indoor Monitor, Drawn Acrylic Case, Slim Design, Fashionable Touch Button Two-way intercom, audio and video chat, call transfer between monitor and doorbell or monitor and monitor 1 camera and 4 color LCD monitor, supporting 1 building which has 4 households. You can see and hear before you are at the door. Helps to adjust the communication volume, screen color, screen brightness. Has 4 call button on the camera. Everyone can connect to a monitor. Very suitable for 4 houses/apartments.