Genius MousePen i608X, New Pen and Mouse Design, USB, 2560 LPI, Report Rates (RPS) 100 RPS 6†x 8†working area for drawing and handwriting 1024-level pressure sensitivity for all shapes and thickness control Make handwriting notes/drawings efficiently in email, MSN, documents, or any application program 3-button cordless wheel mouse for fast browsing on the Internet and in documents Pen clip design for pen easy storage Supports: Windows 7/XP/Vista/Macintosh with OS X 10.3.5 or later