Fitbit has today lifted the wraps on three new activity and sleep tracking devices, all of which offer slightly different features depending on the intended use. The cheapest of the new trackers_– and the only one available in the US from today – is the_Fitbit Charge, a $130 device that allows you to_track your everyday activity (steps, distance travelled, calories burned etc.) as well as see incoming call alerts. It’ll also allow for the manual logging of other workouts and users can view summaries on their Fitbit dashboard. Claimed battery life is up to seven days, and the company said...

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