Simply put, a Doorbell Camera is exactly what it sounds like: an invisible camera fitted to your home with a digital camera. That camera is connected to your existing home telephone wiring via a wireless connection, and your home's already existing doorbell wiring. When somebody pushes that doorbell, it notifies the camera, just like a regular doorbell. There is usually a tiny screen on the front of the camera showing live footage of the person pushing the doorbell - so if somebody does try to o...