Fitbit is making some big changes to its bread-and-butter fitness trackers, according to leaked images from TechnoBuffalo. Photos of the Fitbit Charge 2 and the Fitbit Flex 2, both successors to two-year-old devices, reveal a sleeker look, and in the case of the Flex 2, a swim-proof design.

The Charge 2 has a much larger display than the original Fitbit Charge, and takes a lot of design cues from the Fitbit Alta, released earlier this year. The Charge 2 also has an optical heart rate monitor, which seems to indicate that Fitbit will be dropping the “HR” from its naming convention, as was the case with the older Charge HR (versus the Charge). Other features include all-day activity and sleep tracking, interchangeable bands, and smartwatch notifications.
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