100% brand new and high quality.
Mouse Name： normal version/upgrade version
Buttons: 6 buttons with scroll wheel.
Tracking systems: Optical.
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.
Feel comfortable, mobile and stability.
Switch Life: 50 million times.
Package Size: 15(L) x 10(W) x 5(H)cm.
Compatible with Windows XP, Vista, Windows 7, ME, 2000 and Mac OS…or latest.
User for: The high-end players, gaming professional players.
**********the upgrade version mouse**********