We have assembled a new full-length mirror in our bathroom, the lights above the mirror had not switched on the light switch. So I looked for a way that comfortable on and off lights. The mini-sensor motion detector is the ideal and also quite cost-effective solution here. Behind the mirror is enough space for installation of the relay box, the sensor we mounted directly beneath the wooden frame of the mirror. Installation is simple, the sensor is therefore for this application just fine. The specified from other buyers loud switching noise, I can confirm, but think this is not uncomfortable or even annoying, but more suitable for our application.