Zowie Gear Black EC2 Optical Gaming Mouse Retail 1.5 mm lift-off distance. One of the lowest on the market to date. One of the primary features of the ZOWIE EC-series is the lift-off distance. 1,000Hz USB Report Rate - plug and play with 1.000Hz. Most optical mice are 125Hz which can be artificially raised to 500 - 1,000Hz through driver installations. Improved mouse wheel. The mouse use an optical encoder instead of the cheaper traditional mechanical system. DPI-adjustment. Adjusting DPI on the fly is not really an innovative feature, but ZOWIE decided to put it on the mouse anyway, as it's important for a gamer to be able to optimize the settings to create the perfect feeling when playing. Specifications:Frames Per Second: 6,500 Inches Per Second: 40 Dots Per Inch: 500/1.000/2.000 Max. Acceleration: 15G 1,000Hz USB report rate Connector: USB