Plantronics Voyager PRO HD User Manual page 6

The Smart Sensor™ technology in this headset
recognizes if the headset is being worn
and can automatically perform time-saving
functions.
Automatically answers calls
When you have an incoming call, put on the
headset and the call will be answered
automatically. You do not have to press the
call button.
Never dials by accident
When you are not wearing your headset
the Call button locks to avoid accidental
dialing.It unlocks when you put on the
headset.
Directs incoming calls
If you are not wearing your headset and
there is an incoming call, it will be routed to
your phone, which might be easier to find.
When you do put the headset on, the call
LEARN ABOUT SENSORS
will transfer to the headset and will
automatically answer.
You will hear a voice prompt "answering call."
If you are already wearing your headset and
there is an incoming call, it will be
routed to the headset so you need only
press the Call button to answer the call.
Knows when to pause audio
If your phone, laptop or tablet PC supports
Bluetooth A2DP stereo streaming, you can
listen to streaming audio.
If you remove your headset while listening
to streaming audio, the sensors will
automatically pause the audio until the
headset is placed back onto your ear.
If you have been streaming audio
for less than 10 seconds you will have to
manually restart the media player.