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Check your heart rate 38
Custom heart-rate zones 39
Earn Active Zone Minutes 40
Share your activity 41
View your cardio fitness score 41
Control music with the Spotify app 42
Fitbit Pay 43
Use credit and debit cards 43
Set up Fitbit Pay 43
Make purchases 44
Change your default card 45
Pay for transit 45
Update, Restart, and Erase 46
Update Charge 4 46
Restart Charge 4 46
Erase Charge 4 47
Troubleshooting 48
Heart-rate signal missing 48
GPS signal missing 48
Other issues 49
General Info and Specifications 50
Sensors 50
Materials 50
Wireless technology 50
Haptic feedback 50
Battery 50
Memory 51
Display 51
Band size 51
Environmental conditions 51
Learn more 52
Return policy and warranty 52
4
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