Details:The AZIO Vision keyboard features extra-large print keys to reduce eyestrain and promote productivity. To further promote visibility, this keyboard features 5 backlight colours including Red, Pink, Blue, Cyan, and Chartreuse***. The backlight brightness is easily adjustable by simply turning the brightness wheel. Productivity is further simplified with dedicated internet and multimedia hotkeys. Enhanced visibility, colourful backlights and built-in hotkeys, the Vision keyboard is a keyboard people of all ages will love. ***The colour Chartreuse sits directly in the middle of the frequencies of visible light, making it the most visible colour to the human eye. Specifications: Interface: USB Large Print: Yes 5 Colours Backlight: Red, Pink, Blue, Cyan, Chartreuse Cord Length: 4.5 feet Hotkeys: Email, Home, Favourites, Play/Pause, Previous Track, Next Track, Stop, Volume +/-, Mute, Media Player, My Computer, Calculator OS Support: Windows XP, Vista, 7, 8, 8.1 Dimensions (LxWx): 7.8 x 18.3 x 1.0"