Ever had the feeling someone’s watching you? Like there’s a camera trained at your back, or a microphone listening to everything you say? OK, so paranoia’s a terrible thing, but you never know, you might actually be under some sort of covert surveillance and you don’t know it. Well there is a way to fight back you know.

This Credit Card Style Bug Detector is billed as the ‘ultimate counter surveillance detection tool’ and who are we to argue? Whip the device out of your pocket and you’ll be able to detect a wide range of radio frequencies, which basically means you should be able to detect any wireless transmitters lurking in teddy bears of alarm clocks in the room. The product runs for up to 32 hours off a set of watch batteries, and it’s thin enough to slot into a purse or wallet. Priced at $299.95.