The Fitbit One tracker is powered by a rechargeable built-in battery. To charge your Fitbit One, align the gold contacts on your tracker with the gold contacts on the inside of the charging cable, then plug it into your computer's USB port or any other USB charging device.
More information is available on the Fitbit website:
https://help.fitbit.com/customer/portal/articles/798866-how-do-i-charge-my-one-
Hope that helps!
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