Wheel scrolls up and down more easily
Speed button:lnstant sensitivity adjustment between 400~800~1200~1600DPI 
USB port connection
Ergonomic desigh with4 splendid LED lights indicates the speed status 
Fire Button:super strong fire,click one time with four shots
The special function is that we Press"fire button" once,and there's red light on the transparent wheel, click the left of the mouse simultaneously,
then we make a a-bullet continuous shooting 
press"fire button" twice,and there's blue light on the transparent wheel,click the left key of the mouse simultaneously,then we make a 3-bullet continuous shooting
press"fire button" three times,and there's purple light on the transparent wheel,click the left key of the mouse simultaneously, then we make a 4-bullet continuous shooting
wheel,press"fire button"one more times,then there will be no light on the transparent - wheel; click the left key of the mouse simultanously
then we make a 1-bullet shooting