This gaming mouse has a new design of left-scroll that different from traditional middle scroll mouse. It is more ergonomical and more comfortable for your hands. Suitable for high-end players， gaming professional players， etc.  Features:  New design left-scroll mouse replacement traditional middle scroll mouse.  High-end optical engine， precise positioning.  Ergonomically designed， more comfortable for hand.  High sensitive， 800-1200-1600-2400DPI available.  Release pains of your finger and wrist after long time use.  Colorful backlight design， giving you a great visual effect.  Stylish and elegant appearance.  Specifications:  Material: ABS  Color: Black and red  Tracking system: Optical  Resolution: 800-1200-1600-2400DPI  Support system: Win98/2000/XP/Vista/7/8， Linux， Mac， Andriod  Connection: Wired   Port: USB 2.0  Item size: 11.5 * 7.5 * 3.9cm / 4.52 * 2.95 * 1.53（L * W *H）  Items weight : 117g / 4.13oz  Package sise: 15 * 11.5 * 5cm / 5.90 * 4.52 * 1.96 L * W *H）  Package weight: 153g / 5.42oz  Package List:  1 * USB wired optical mouse