Feature: 100% brand new and high quality. 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.Package Content: 1 X 5500DPI Gaming Mouse(without retail package)