107 or 108 + 9hot keys available, waterproof, multimedia and 3D optical with 1600dpi one-touch access to email and web home,lntergrated controis for music and 3D mouse human engineering designing, suitable foreither right-handed or left-handed person Multiple language version availabie PS/2 or usb available compatibility system:windows 95/98/2000/NT/XP The high penormance is distinguished by their configuration an dsimpie shapes thatmeetthe fatest computer ftend |