I used to be able to take a screwdriver and disassemble household appliances to figure out how they worked. It served me well in the past, but technology has passed me by. I recently bought an XBox (no I didn't take it apart, yet). Inside one of the games there are two anti-theft devices, you know the kind, they set off the alarms if you try to take them out of the store without paying. One of them is a paper thin sticker, about 1 1/2" square. Looks like a printed circuit. the second is a black plastic rectangular box about 2" x .25" x .1" which, when cut open has some thin metal strips inside. How do these things work? I sort of understood the ones that had to be demagnetized by a clerk before you could take it out of the store, but these apparently don't have to be. I'd like to know how they work simply because I don't like not knowing something. If you don't know the answer just give me something that sounds intelligent so I can repeat it and look smart if anyone ever asks me how these things work.