USB 5D Extra Function Wired Optical Mouse * Dimension (W*H*D): 108*61*37mm * Ergonomic design * Good idea for desktop & laptop * Extra Forward & Backward function * Newest optical technology with 1200dpi high resolution * Extra forward & backward function * Key switch life more than 5 million times * Support Win 98/2K/NT/ME/XP/Vista/7, Linux,and Mac 10.0 higher version