Button functions guide:
Language switch: when turn on the headphone, long press the "+" and "-" button until appear red and blue light flashing three times.
Resume to default setting:  plug charger and press+/- for 3s.
Redial Lastest number: double click call button.
Note: You can answer phone when take it from charger; Hang up the phone when put it on the charger.

Indicator light:
Turn on: blue light flash twice.
Pairing status: red and blue light flash alternately.
Pairing Time: 90s
Standby when connect to phone: blue flash every 7 seconds.
Charging status: red light is always on.
Fully charging: blue light is always on.
Switch language: red and blue light flash for 3s at the same time.

Feature:
Multi-point: Can connect to two devices at the same time.
Switch songs and adjust volume.
Support to display battery level on IOS system.

Specifications: