As a motion class and an easy solution. I wanted him but Fazu utilize in a building in passing person outside, the light to turn on. And I have a lot of experimentation. The detector accepts no movement by any indoor door (thin), front door or window pane note. Not even with the strongest setting and directly A window or door. Too bad ..., would have been too good. Use it now in the boiler room. Does there but very well ... So maybe the description adjust something. It's annoying.