optical mouse with vertical shape                                                                                the design eliminates the muscle tension created in the forearm,neck,and shoulde.                                                                                                                        Operating System: window/98/nt/2000/me/xp
Interface: USB and PS2                                                                                             Dimension:120*75*70mm                                                                                          keystroke lifetime: over 3 million times                                                                        Scroll wheel lifetime: over 300,000 circles
Wheel: Yes
Resolution: 400/800/1600dpi
Power consumption: 20-40MA(DC5V)