Yeah, I didn't see anything about the motion sensors either, but that's what I bought.
It's not "motion sensor" as if it lights when you walk in a room, it's "motion sensor" as if "it lights when you wave your hand past it".
The first wave turns it on at full brightness, a second one turns it to half brightness, and a third turns it off. If you don't wave that third time, it turns off after an hour evidently.
I think it would be sweet above a turntable or disc player where you need some light for a minute or two...
