The Cintiq 21UX 21.3" TFT display with interactive pen provides the best-of-class pen experience for working directly on the screen. It combines the advantages of a large-format LCD monitor with the control, comfort, and productivity of Wacom's most sophisticated patented cordless, battery-free pen technology. With a 21.3" TFT diagonal display, the Cintiq 21UX delivers a highly sensitive pen-on-screen experience and a generous active area for working directly on large images, concepts, and designs in the most natural way possible. Working directly with the pen on screen is a natural motion that gives you an unprecedented degree of control and allows you to take advantage of natural hand-eye coordination, helping you work more intuitively and noticeably faster. The display's completely flat surface allows the hand and pen to glide over the surface of the Cintiq without bumping into any bezels or borders. A dynamically adjustable stand allows you to rotate the display up to 180-degrees in each direction, incline the display from 10-degrees to 65-degrees, and even remove it for comfortable lap use. Aspect Ratio - 4 - 3 Screen size - 21.3 diagonal Display area - 17 wide x 12.75 high Native resolution - UXGA (1600 x 1200) Pixel pitch - 0.27mm x 0.27mm Brightness - 220 cd/m2 Contrast ratio - 550 - 1 Resolution - 5080 lines per inch ExpressKeys - 8 user-assignable Touch Strips - 2 finger-sensitive and front mounted Pressure-sensitive, cordless, battery-free pen type Switches - Tip switch, 2 side switches and eraser System Requirements - Windows 2000, XP or Vista (32 & 64 bit) or Macintosh OS X 10.3.9+, available DVI or VGA connection and USB port, and CD/DVD drive Dimensions - Width 22.1 x Height 16.5 x Depth 1.8 without stand; Weight - 18.7 lbs without stand, 22.4 lbs w/ stand