Perman 4000 DPI 6 Buttons Wheel Professional Colorful Backlight LED Optical USB Wired Gaming Mouse Mice Size: 130(L) x 71(W) x 43(H)mm. 1mm=0.039". Buttons: 6 buttons with scroll wheel. Adjustable DPI Switch: 1200/2500/3200DPI/4000DPI. Ultra-precise Scroll Wheel. Tracking systems: Optical. Compatible with Windows XP, Vista, Windows 7, ME, 2000 and Mac OS...or latest. User for: The high-end players, gaming professional players.