what is the difference between a fitbit charge 2 and 3

Fitbit Charge 3 vs Charge 2 REVIEW Fitbit Charge 2 vs Charge 3 vs Charge 4 Fitbit Charge 2 vs. Charge 3: The Fitbit Charge 3 or Charge 2: should you Fitbit Charge 2 vs Charge 3 - The Fitbit Charge 2 vs Fitbit Charge 3 Fitbit Charge 3 v Charge 2: Which Fitbit Charge 3 vs. Fitbit Charge 2 Fitbit Charge 3 vs Fitbit Charge 2 Fitbit Charge 3 vs Charge 2: Which one Fitbit Charge 3 or Charge 2: should you Fitbit Alta HR Review u0026 Comparison to Fitbit Charge 2 vs Charge HR - Android Fitbit Charge 3 hands-on: An all-week fitbit charge 2 compared to fitbit Fitbit Charge 3 Vs. Charge 2 - FitRated Fitbit Charge 3 vs Charge 2: which what is the difference between a fitbit charge 2 and 3