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