Specifications : -Sensor: Optical, Marvo 8812. -DPI: 800-1600-2400-4000 -Buttons: 7 (programmable). -Switch rating: 3 million clicks. -Backlight: 7 colors. -Interface: USB 2.0. -Cable length: 1.5 m. -OS support: Windows 7 or newer. *Feature : -High-profile design with full palm support. -Enhanced control for palm and claw grip styles. -Rubber scroll wheel for enhanced feel. -7-color backlight  with breathing effect.