User guide for Fitbit Charge 3 with essential tips and tricks. Fitbit Charge 3 Fitness Activity tracker measure calorie burn, understand resting heart rate & more with 24/7 heart rate tracking and many more. Using this app, you will able to learn everything you need to know about this fitness tracker. App content: # Set up Charge 3 # Wear Charge 3 # Change the wristband # Navigation and Quick settings # Change the clock face # Notifications # Phone and Messages # Timekeeping # Activity and