My only fault with the installation is that with all elements installed, the shaft only has a few turns of grab. It is possible that my front door is thicker than usual. The motion sensor is provided as an add-on kit. I made use of the ball mount to point it sharply down to limit tripping on road traffic. It Both camera and sensor work through my sun-shielding screen door. I would appreciate a small ping when the sensor trips and the camera takes a picture, for when I'm waiting on a delivery. The picture quality stored on the micro SD card (max 32 GB, not supplied but necessary) is much better than can be shown on the display, but that's still adequate for identification. I really like that I don't have to stoop to see out the peephole anymore, simply push one central button.