Charging status:
1. White breathing light: Charging
2. Solid-white light: Fully charged
3. Flashing white light: Pairing mode
Battery status:
1. No light: Battery fully depleted
2. Red light: Battery level below 10%
3. White light: Battery level at or above 10%
Factory reset:
Press and hold the Bluetooth pairing button for 10 seconds. The reset is successful when the red light flashes 3 times, and then stays solid white.