I will be show you how to replace/install your old doorbell with a new blink video door bell system using your existing wiring. If you don't have wiring already you can use the wireless system only. Also I am installing a corner, or wedge, so we get a better view of the door. This will allow the blink system to work, and also you can use your old door bell ring as well on top of the Blink ring tones.