X-Micro Tech. BT400GII - Manual (Page 13)

Appendix I
Button Function
Turn ON/OFF Press the power button for 3 seconds until the
blue LED flashes five times.
Answer/End calls Press the power button once
Power Button
Pairing When the headset is off, press the power
button to turn on and keep it pressed for
about 5 se4conds until the LED flashes blue
and red alternately.
Volume control Press the UP or DOWN button repeatedly
until you reach your desired level.
Down/Up Button
/
Mute/Unmute Press the UP or DOWN button for about 2
seconds
Appendix II
Audio Tone
Turn On Two high tones
Turn Off Two low tones
Pairing mode Two High tones
Incoming Call A ring tone at 2 seconds interval
Mute
Repeated two low beeps at 3 seconds
interval
Unmute A single beep
Battery low
Start when the talk time is left about 3-5
minutes. At a 16 seconds interval