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To use the boom, gently pull it down 
toward your mouth (14), or push it 
up to its initial position (15).
Adjust volume
The headset automatically adjusts 
the volume according to ambient 
noise. To manually adjust the 
volume, slide the volume key up or 
down. To adjust the volume quickly, 
slide and hold the key.
The selected volume level is saved 
for the device that you currently use 
with the headset.
Calls
To make a call, use your mobile 
device in the normal way when the 
headset is connected to it.
To redial the number you last called 
(if your mobile device supports this 
feature with the headset), when no 
call is in progress, press the answer/
end key twice.
To activate voice dialling (if your 
mobile device supports this feature 
with the headset), when no call is in 
progress, press and hold the answer/
end key for about 2 seconds. 
Proceed as described in the user 
guide of the mobile device.
To answer a call, pull the boom 
completely down toward your 
mouth, or press the answer/end key. 
(For noise cancellation, the boom 
has to be completely pulled down.) 
To reject a call, press the answer/
end key twice.
To end a call, push the boom up to 
its initial position, or press the 
answer/end key.
To mute the microphone, slide the 
mute key toward your mouth. To 
unmute the microphone, slide the 
mute key to the opposite direction. 
When you mute or unmute the