Put a GSM SIM card in this little box, and stick it in a room-hopefully with GSM signal. When you call the number, you can hear what's going on in that room. Pretty simple little device, really, though it could do with some better Camouflage.

This box probably won't be as useful in the US since they are missing GSM 850 frequency support. However, it could be useful in Europe or places where you have strong GSM 1900 signal (e.g. native T-Mobile). It wasn't tested in the US, but there's no reason it shouldn't work.

Of course, I have to give the obligatory warning: just because you can do something, it doesn't mean you should. Stay legal, folks.

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