That looks like a motion sensor to me. Would be difficult to see well through that clouded dome anyway, unless there is a pinhole somewhere to see through. What is stopping you from taking it down and looking at it yourself?
I couldn't see a pin hole. I thought it was a motion sensor. It is in my place of work (supermarket) i thought we was being spied on as someone said there are covert cameras around the store. Just thought it was illegal so was going to take it further