Dell Mobile Projector M900HD - Manual (Page 26)

When you connect the projector and computer via USB cable, a USB
Connected message will pop up and allow you to select DoUSB or
Storage Mode.
VIDEO MODE
The Video Mode menu allows you to optimize the display image. The
options are: Presentation, Bright, Movie, sRGB (provides more accurate
color representation), and Custom (set your preferred settings) mode.
VOLUME
The Volume menu allows you adjust the volume setting of your projector.
V OLUME — Press to decrease the volume and to increase the volume.
Using Your Projector 26