With this high-quality video doorphone system, you can distinguish expected visitors from door-to-door bagman. It features the 4-inch flat B/W CRT monitor which enables you to view the callers before letting them in. Just pressing a button on the monitor, you can unlock the door remotely. In addition, the ultra-thin design of the monitor is so attractive that it can double as an adornment. If you have security concerns, get yourself this video door phone, it maximizes your personal safety.