Jabra PRO 920 - Manual (Page 14)

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english
Jabra PrO 920
5. jABRA PRO 920 FEATURES
5.1 HEADSET mULTI-FUNCTION BUTTON
the multi-function button can answer calls and end calls using a combination of taps, double-taps or presses.
Multi-function button
Function tap Double-tap
Press
(hold 1-3 seconds)
answer incoming call

end current call

Reject incoming call

Put current call on hold, and accept incoming call
(not supported by all phones) 
Power on

Power off

(5 secs)
5.2 HEADSET SPEAKER VOLUmE BUTTONS
the speaker volume buttons adjust the headset speaker volume.
speaker volume buttons
5.3 HEADSET mUTE BUTTON
the mute button mutes or un-mutes the headset microphone.
Mute button