Like the Charge HR, the Charge 2 uses a watch-style buckle design, so it's easy to fasten around your wrist.

(Opens in a new window) Read Our Fitbit Alta Review There's a single button on the left side of the display, and a built-in continuous optical heart rate monitor underneath. It's basically a silicone band with a rectangular OLED display module in the middle.

In terms of design, the Charge 2 is similar to the Fitbit Alta ( at Amazon) (Opens in a new window). It offers the best balance of comfort and functionality you'll find in this price range, making it our new Editors' Choice for midrange fitness trackers. Basically, it does everything the Fitbit Charge HR ($124.98 at Amazon) (Opens in a new window) could do, with more features and an improved design. And the display is modular, so you can pop it out and place it in a variety of different bands. There's no built-in GPS, but you can connect your phone to help capture running routes and calculate lap splits. It automatically tracks your calories burned, distance traveled, heart rate, steps, and sleep, and a new mode helps you return your breathing to normal after a workout. The Fitbit Charge 2 ($149.95) is the best new fitness tracker we've tested in some time.

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Fitbit charge 2 charger