Essentially a very smart 3D pedometer, the Fitbit clips unobtrusively onto your jeans or bra strap during the day and figures out how far you've gone and how many calories you've burned. The $99 price tag, though, is justified by some serious added functionality. Taking cues from the Wii and the Nike+ iPod system, Fitbit has enough logic to distinguish between walking, running and riding in a car, and syncs the daily results with the user's computer, posting them to a socially networked website. Moreover, it analyzes sleep patterns when worn at night by detecting REM-induced tremors.
Fitbit - Automatically Track Your Fitness and Sleep
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