Freedom Scientific Ruby User Manual page 8

Button Descriptions
Power (Green/Yellow): Press to turn power on. Press it again to
turn power off.
Color Select (Blue): Press to cycle through Normal (color), Black
on White, White on Black, Yellow on Blue, and Yellow on Black
color displays.
Magnification (Yellow): Press to cycle through three different
magnification levels. Magnification varies depending on how far
you hold RUBY from an object.
Freeze Frame (Red): Press to freeze the current image. Press it
again to turn off Freeze Frame mode.
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