Reset your Fitbit. If the above Fitbit troubleshooting didn't fix the problem, it's time for a full software reset. Resetting ...

If your Bluetooth devices won't connect, it's likely because the devices are out of range, or aren't in pairing mode.

You connect your smartphone to the device via Bluetooth, tune your car stereo to the device’s FM frequency, and everything will work seamlessly via your car stereo: music, phone calls, the works.