Wireless and wallet-friendly—like a tracker should be

TL;DR: Looks like a credit card; acts like a GPS—get three KeySmart SmartCards for just $79.97 (reg. $119.97).
You know what no one misses? That mini panic attack when you reach for your wallet and it's not there. Cue the frenzied pocket pat-downs, the seat cushion diving, and the inevitable spiral into 'I swear I just had it.' — Read the rest
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