Buttons: 7 buttons with scroll wheel.Tracking systems: Optical.The Max DPI: 5500DPI.Ultra-precise Scroll Wheel.Optical technology works on most surfaces.Ergonomically designed， long-term use without fatigue.Intelligent connectivity， no need to code， plug & play.Built-weight iron， feel comfortable， mobile and stability.Switch Life: 5 million cycle.Size: 127(L) x 85(W) x 37(H)mm.Weight: about 140g.Compatible with Windows XP， Vista， Windows 7 8， ME， 2000 and Mac OS...or latest.User for: The high-end players， gaming professional players.