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.