Just come back from a weekend away. The hotel room didn't have the usual keycard slot to switch on lights etc. But a motion sensor.
There was what looked like a large thermostat on the wall, this had a built in motion sensor, there was another sensor in the bathroom, and a door sensor.
So if the door was opened and then closed sometime later the thermostat switches off the power to the room. My wife found this out when I left the room and she was on the bed reading. She just moved a bit and the power came on again.
Anyway I have found out ome more info about the system and decided to share my findings.
There was also a small LED on the top of the door frame which I later discovered to be an occupancy checker. Cleaning staff have a small hand held device, which they point at the door and if the LED is green the room is empty, if its red its occupied pretty cool really.
Instruction manual
Product info