The ColorMouse-USB is an ergonomic, hand held color video magnifier that is designed specifically for use with a computer. This makes it great for classroom or office environments where you need a computer and a CCTV. Plug it in to any USB 2.0 port and receive up to 22X magnification on a 20" monitor. Split screen capability gives you the option to view your magnified material and your computer material at the same time. Color USB version offers reverse mode for black on white or white on black viewing, in addition to full color. One year warranty.