VOX feature will not work without the Vox Headset Microphone. The built in mic of UH076SX is temporarily disabled, however accidental pressing of PTT will cause the unit to transmit briefly.
To activate VOX
1. Press and hold vox for 1.5 secs. VOX icon blinks.
2.Press either 
or 
within 10 secs to select the desired VOX sensitivity level (9 with the lowest sensitivity to 1 with the highest sensitivity).
3.Press vox to save the selected level. VOX icon stops blinking.
4.Install VOX Headset (not supplied) to UH076SX.
To De-activate VOX
1. Remove VOX Headset from UH076SX.
2. Press and hold vox for 1.5 secs. until VOX blinks.
3. Press 
repeatedly and until oF is displayed.
4. Press vox to save the setting. VOX icon disappears.
Changing the VOX sensitivity setting to oF without removing the microphone will cause the unit to transmit continuously.
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