Hytera TC-580 - Manual (Page 33)

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5. Power the radio off or press the VOX key again to
deactivate this function.
Whisper
With this feature, even if you speak with a very low
voice, it can still be heard clearly by the receiving party.
Operation:
Press the programmed
Whisper key to activate this
function ( appears and an alert tone sounds); press
the key again to deactivate it (the icon disappears and
the alert tone sounds twice).
Reverse Display
With this feature, the displayed information on the
display can be rotated by 80 degrees.
Operation:
Press the programmed
Reverse Display key to rotate
the displayed information by 80 degrees (an alert tone
sounds); press this key again to restore the display (an
alert tone sounds twice).
Note:

If the PTT/VOX Switch on the earpiece
is set to PTT, you can only transmit by
pressing the external
PTT, no matter
whether VOX is activated.
 When the PTT/VOX Switch is set to PTT,
you are not allowed to switch it from PTT
to VOX directly; otherwise, continuous
transmission may occur. If continuous
transmission occurs unexpectedly, you can
restore the radio to normal operation by
toggling the switch from VOX to PTT, or
turning the radio off and back on.
 You can select an appropriate VOX
sensitivity according to the environment. If
there are heavy noises, you’d better select
a lower VOX sensitivity.
Functions and Operations