Hi, I’ve been busy with this problem for a long time until I found the solution. And it’s called RCWL-0516 Microwave Radar Sensor. Guys, forget PIR sensor, the RCWL-0516 you can completely obstruct in the frame behind the mirror. It works perfectly with paviro / MMM PIR sensor. You get 5 pieces for 8 € on Amazon. I hope I could help you. And forgive me my bad English. Regards