what is the tracker on a fitbit

Fitbit Charge 4 Is Here: What You Need Fitbit Official Site for Activity Buy Fitbit Charge 4 Fitness Tracker Fitbit Inspire HR Health and Fitness Fitbit Charge 3 vs Inspire HR: Which Best Fitbit in 2020: Choose the right 101 Guide for Fitbit Charge 2 Fitbit Comparison | Compare Fitness Fitbit Comparison | Compare Fitness Buy Fitbit Charge 4 Fitness Tracker Fitbit Inspire Fitness Tracker The No Radiation Fitness Tracker Fitbit Charge 4 Review: A Simple and How do I get started with Fitbit Charge 3? 6 Best Fitbits for Women 2020: Fitbit Fitbit unveils Charge 4 tracker with Fitbit Inspire 2 Fitness Tracker (Black Fitbit Launches Ace Fitness Tracker for what is the tracker on a fitbit