I made an electrical installation on a building staircase and installed these sensors on various floors to automatically turn on the lights. At first, I thought they occasionally get stuck, but no, they are just a bit particular and sensitive to the settings you make on them, so dedicate some time to make a good adjustment and they work just fine. One negative aspect is that the sockets where the wiring goes in are quite small, so it's difficult to connect and pass the cables. However, they are nice, discreet, and affordable. They do their job just fine, even better than other more expensive ones on the market