Superior Ergonomic Design: The creator's of the world's first vertical mouse User convenience with Vertical mouse 's signature, pen-grip comfort. Five Button, Full Function Mouse: Introduces an all-new second right click button for this five button, full function mouse. You pick the hand position that best suits you. Plug and play. Compatible with Mac and PC. Interface: USB (Cable 1.5m / 5ft) Resolution: 800dpi Weight: 130g / 4.6oz (include USB cable) Demension: 82(W) x 100(D) x 80mm(H) / 3.2in(W) x 3.9in(D) x 3.1in(H) Button: 4 buttons in default / 1 scroll wheel (middle button) System Requirements O/S: Windows 98/Me/2000, Windows XP, Vista Mac OS X+ Linux