Albrecht VOX Guide D'utilisation page 8

2. VOX hands-free function
2.1. Activate VOX function
Hold down the M (2) button for approx. 3 seconds to switch
the VOX hands-free function on or off. A signal tone sounds as
confirmation.
2.2. VOX sensitivity
The higher the VOX sensitivity is set, the faster the microphone
automatically switches to transmit mode.
Press and hold the  (1) Up button for approx. 3 seconds to
activate the VOX sensitivity. You can now set the sensitivity in 4
levels with the / buttons.
The selected level is indicated by a number of beeps and blinking
of the LED. Wait several seconds to apply the selected level.
2.3. VOX delay
Set the delay time before switching from transmit to receive
mode.
Press and hold the  (3) Down button for about 3 seconds to
activate the VOX delay. You can now set the delay in 4 steps (0.5
/ 1 / 1.5 / 2 seconds) with the / buttons.
The selected level is indicated by a number of beeps and blinking
of the LED. Wait several seconds to apply the selected level.
2.4. Active Noise Cancellation
During operation it should be avoided that (when the VOX
function is activated) a transmission is started by any noise for
example from the vehicle or from the radio. The Active Noise
Cancellation function (ANC) helps to avoid this behaviour.
The ANC also filters out annoying background noise during
transmission and thus ensures better sound quality.
ANC function is activated by the switch (6) below the PTT
button.
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