Pen pressure level: Maximum 1024 level, Number of function keys: 4, External dimensions ( W x D x H ): 8.2 x 7.0 x 0.4 ins ( 209.9 x 177.5 x 10.0 mm. Application software ( download ): ArtRage 3.5, Autodesk SketchBook Express Accessories: Tablet unit, pen, tablet driver CD, quick start guide, 3 refills (back of unit ). Color Pen Ring ( Black ) Pen Holder ( Black ) USB Connection Cable Application Download Guide Reading range: 6.0 x 3.7 ins (152.0 x 95.0 mm ), Reading accessibility: ±0.02 ins ( 0.5 mm ). Read Speed: Up to 133 points per second, Read Height: 0.3 ins ( 7 mm ), Weight: Approx. 10.6 oz ( 310 g ). Supported Systems: Windows 8/Windows 7 ( SP1 or later), Vista ( SP2 or later). Mac OS X 10.6.8 or later