1771MT 　 　 　 Function Use the LCD displayer and build in storage to play the video circularly in the public place. Especially for the public information or AD clips. Features: Displayer: Display Colors: 16.7 million colors Contrast Ratio: 400:1 Brightness: 260 (cd/m2) Screen Size: 17"-42"   Storage: CF card:512M-2G Video format: MPEG4. Speaker: Yes Auto turn on and off: Yes Card locker: Yes Optional: Wall Mount