Please have a look at the attached photos. Many thanks, Junaid
That is an electronic pest deterrent device with built in night light. It emits high frequency audio which is suppose to be above human hearing but within the range mice, rats and bugs can hear. The idea being it will annoy them enough that they will stay away. Truth is these things don't work. Insects could care less. When first plugged in it may scare off rodents but they will get use to the sound and ignore it after a while. So it' has the frequency and pitch adjustments to try and change things up but it's only temporary at best.
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I also found that it was a pest deterrent device (the rest of your post i am not qualitfied to argue neither for or against) but would like to add this link i found while trying to figure this out (which looks like this exact device): http://www.primrose.co.uk/pest-deluxe-mouse-and-r...
I think I found some additional documentation for this gizmo, here:
It is like you say. It is PR-3000, super deluxe, pest repelling thingy.
Looks like a stud finder right off.