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)
KL-V101 Vertical mouse guaranteed 100%+good quality+fast delivery time+free shipping