The retaining springs are bad quality. one of them broke after bending it a couple of times
Received the 2 sensors I ordered a couple months after ordering. Have installed the sensors in our hallway and set to night time operation only and these constantly trigger every few minutes throughout the night, with no movement present. The seller advised to adjust the dials, but there is no sensitivity adjustment, only time and lux, (adjusting the lux makes the lights come on randomly during the day when there is no movement). Another thing I noticed was the relay clicking each time the sensor was triggered, this is very noisy (can be heard in a bedroom down the hallway when doors are closed). Either these are faulty sensors, or they are rubbish, seller is not replying and I am no longer able to open a dispute. Would not buy again :(