what is the difference between a fitbit alta and a fitbit charge 2?
The Charge 2 is the Alta HR, but with a larger casing, larger display, and Connected GPS. Mainly, however, you'll get the Charge 2 heart rate if you want Connected GPS because both have the wrist heart rate monitors and around 4-5 days of battery life on average. ... Perhaps you prefer the smaller design of the Alta HR.