So a peephole camera does nto work well with a glass storm door in front of it. So i picked up a bridge and an external motion detector. Unfortunately there is lag in the system. It takes about 10 seconds before the camera starts recording. By that time the person at the door has turned around. I have adjusted the sensitivity, angles, all sorts of things. This is a word of warning. If you have a glass storm door do not get the peephole version.