Reject a Call*
Press the MFB 
for approximately 2 seconds when the phone rings to reject an incoming call. Depending on your phone settings, the person who called you will either be forwarded to your voice mail or hear a busy signal.
Activate voice dialing*
Press the MFB 
for 2 seconds. Whit for the beep and then announce the name you wish to call.
For best results, record the
Redial last number*
Press the MFB 
twice when the headset is on and not used.
Adjust sound and volume
During conversation or music listening, push the 3 way button towards the volume up (+) or volume down
Microphone Mute
This lets you mute the microphone so the other side will not hear you.
Press the MFB 
to mute the microphone. Press the MFB 
to reactivate the microphone.
Functions marked with * are dependent on your phone supporting these features.
Check your phone’s user manual for further information.
How to Play Music in Stereo
Your HB420 headset realizes its full potential when connected via Bluetooth to a Bluetooth stereo device. The buttons on the
start play
Start the music using the controllers on your music device
Pause
Press the
Stop
Use the controllers on the music device
Answer a call when playing music*
Press the MFB 
to pause the music and the call will be connected. The music will resume after the call has ended (depending on the device supporting this feature).
Skip one track forward
Press the Next track ( ( button - Continue pressing to skip several tracks forward.
Skip one track back
Press the previous track ( ) button - Continue pressing to skip several tracks backward.
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