Brand Wacom PTK-440 and PTK 1240Connectivity Technology USBPressure Sensitivity 2048 LevelsOperating System Microsoft Windows XP SP2, Vista; Mac OS X 10.4.8Special Feature PenAbout this itemUser-defined ExpressKeys & multi-function Touch Ring put time-saving shortcutsNew pen tip sensor technology lowers activation force and captures every nuance of pen pressureQuickly and professionally edit photos and create digital artwork with natural pen control2048 levels of pen pressure sensitivity for precise pressure controlIlluminated ExpressKey displays provide a constant reference for each Keys setting (Bullet only for use with the MediumQuickly and professionally edit photos and create digital artwork with natural pen controlNew pen tip sensor technology lowers activation force and captures every nuance of pen pressure2048 levels of pen pressure sensitivity for precise pressure controlUser-defined ExpressKeys & multi-function Touch Ring put time-saving shortcutsIlluminated ExpressKey displays provide a constant reference for each Keys setting (Bullet only for use with the Medium