Dell S300 Projector - Manual (Page 29)

Using Your Projector 29
17 Menu Press to activate the OSD.
18 Mute Press to mute or un-mute the projector speaker.
19 Zoom + Press to increase the image.
20 Zoom - Press to decrease the image.
21
Volume up
Press to increase the volume.
22 Volume down Press to decrease the volume.
23 Freeze Press to pause the screen image, then press "Freeze"
again to unfreeze image.
24 VGA Press to choose VGA source.
25 Source Press to switch between Analog RGB, Composite,
Component (YPbPr, via VGA), HDMI, and
S-Video source.
26 Auto Adjust Press to synchronize the projector with the input
source. Auto Adjust does not operate if the OSD is
displayed.