If you experience any of the following issues and you've checked your settings, restart your device:
Won't sync.
Won't respond to taps, swipes, or button press.
Won't track steps or other data.
Restarting your device turns it off and on without deleting any activity data.
Hold the Button for 5-10 seconds.
If the LED light turns on and goes red, release the button.
If the LED does not turn red, skip to step 6.
Press the button again for 1-2 seconds until the LED turns green.