Dual-lens Optical Technology 2 Level DPI Ergonomic Design   Technical Details Interface: USB Tracking system: Advanced optical technologyResolution: 800 / 1600 dpi switchable FPS(Frame rate per second): 3000fps Maximum acceleration: 20G Maximum speed: 28 inches/second Feature: 3D 5+1B Optical Mouse, Lens: Dual lens, Internet buttons "Backward" & "Forward“ Certificate: CE, FCC, BSMI Color: Noble Black Cable Length: 1.5m Dimension: (L)127 x (W)75 x (H)42 mm Weight: 126g Support OS: Windows 98/2000/ME/XP 32bit/Vista 32/ 64bit/ Win 7 32/ 64bits