With all the spy gadgets aimed at ruining your clandestine affairs and busting your rendezvous, it's hearting to know that there are counter gadgets out there that help you get back at the wannabe detectives. The Auto Detective Pen is a device that goes crazy when it spies something fishy, as in unknown wireless signals. It emits a light that goes bezerk as you get closer to the offensive spy gadget. Chinavasion claims that it has a range of 10 meters, so celebrities steer clear of this because it won't help you with the sneaky paparazzi.

The "Auto Detective Pen" from Chinavasion costs $16 a piece, but increase your order and they promise you a discount.

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