Motion sensors in 12-24 volts are not very common, especially at this price. After testing a specimen that gave me satisfaction, I bought two more. The device seems fiable.Pas adjustment (brightness, time) but in my case it was not necessary. The case is a little cumbersome if one seeks the discretion (and in fact it is "full of emptiness") but it is robust. The son of connector (input / output) can become detached from the case if required, time to tighten the connecting screws son.