When someone presses the button on this wireless system it calls your land-line or wireless cell phone no matter where you are. You can talk to visitors and unlock a door or gate even if you're on the other side of the world.
This commercial video intercom has 170 degree view and pan, tilt, and zoom camera controls. Records up to 240 pictures. Vandal resistant camera. Can control lights and other devices.
What's different about this system is the monitor is totally portable and handheld. Use it by your front door to see who's there before you open it.