1,25 assignable velocity sensitive keys with excellent performance 8 assignable trigger pads with colorful backlit in working status, comfortable and accurate. 2,4 MIDI control groups: 4 assignable control knobs plus 4 assignable control sliders 4 banks for different settings. 3,8 control buttons: CC Mode, Mod, Bank, Prog, Pitch down, Pitch up, Octave down, Octave up. 4,USB 2.0 Plug and Play, no need of driver installation USB bus powered and no additional power cable needed. 5,Compatible with for Win11, for Win10, for Win 8, for Win 7, for Win XP, for Win Vista, for OS X and compatible with for CAKEWALK and other mainstream music software. Specifications: Color: Black and White Material: Plastic Operating system: Support for Win11 or Win10 or Win 8 or Win 7 or Win XP or Win Vista or  OSX. Item size: 32 x 19 x 3cm or 12.6 x 7.5 x 1.2in Item weight: 745g or 1.6lbs 1 x MIDI Controller 1 x USB Cable