Tiny Tracking Devices for the Spy in You

The dime-sized tracking devices that movie spies stick on villains’ cars don’t exist (that we know of). But there are some fairly small options for keeping tabs on your closest enemies.
1. Lightning GPS Spark Nano
Not much bigger than a Zippo, the Spark determines its position via cell towers. Just tuck it into something you need [...]

Source: http://www.wired.com/reviews/2011/03/pr_reviews_gpstrackers_spy/

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