The additional protuberant button has two special function:
1. Click this button one time to replace dblclick the left button when you need open the file or browse internet.
2. Continuously open fire with bullet when play game. You only need press this button to shoot and avoid dbclicking the left button.

Specifications:
Port: PS/2, USB and USB+PS/2
Software resolution: Up to 6400 DPI
Hardware resolution: 800DPI
Mouse buttons: Three keys+one wheel
Micro switch: 3 000 000 times cycle life
Encoder: Optical+mechanical
Browse way: Vertical+horizontal, Compatibility: Win95/98/2000/ME/XP
Size: 115*65*37mm
Color: Various painting color available

Technology standard: CE&FCC, meet with RoHS and WEEE