Portable USB MIDI Slim line Controller with 9 MIDI control groups: 9 knobs + 9 sliders + 9 buttons. 4 programmable memory banks. 6 transport buttons: Rew, Play, FF, Loop, Stop, Rec. 2 assignable buttons: used as MIDI CC switches. 1 rotary knob for tone adjustment 1 slider for volume adjustment. 2 buttons for sending settled control message.(controller number: 64/67) Support Plug and Play USB 2.0 cable, no need of driver installation. USB bus powered - no additional power cable needed. Support for Win 8 / Win 7 / Win XP / Win Vista / Mac OSX. Item size: 34 x 10 x 2cm, Weight 431 g .