Acer PD724 series - Manual (Page 34)

 English ...
User Controls
Audio
(Computer / Video
Mode)
Volume
 Press the to decrease the volume.
 Press the to increase the volume.
Mute
 Choose the “On” to turn mute on.
 Choose the “Off” to turn mute off.
Power On/Off Volume

Choose this function to adjust volume when power on/off.
Alarm Volume
 Choose this function to adjust volume when there are errors of
the projector.