Many things I buy have a 1 1/2" x 1 1/2" sticker that is white on one side. The other side has a circuit board-looking thingy of concentric silver squares and a shiny pink square in the middle.
I assume this is some kind of security device, though not a very effective one, since it can be easily peeled off.
In any case, how does it work? Is there a battery in there? It’s not magnetic, as far as I can tell. Do silver squares always make bells and whistles sound?