HTC One M8 for Windows - Manual (Page 172)

5. If auto pairing fails, enter the pairing code supplied with the
accessory.
When the accessory is connected to your phone, the Bluetooth icon
appears on the status bar. You can also check the connection status shown
below the accessory name on the Bluetooth Settings screen.
Turn Bluetooth off when not in use to save battery power, or in
places where using a wireless device is prohibited, such as on
board an aircraft and in hospitals.
Disconnecting a Bluetooth accessory
1. Swipe down from the top edge of the screen with one finger.
2. Tap All settings > Bluetooth.
3. Tap the accessory to disconnect it.
To reconnect, just tap the accessory again.
172 Connectivity