Portable mini USB keyboard with 25 velocity-sensitive mini-keyboard keys. 4 programmable memory banks. 6 control buttons: Edit, Mod, Pitch down / Pitch up, Octave down / Octave up. 1 rotary knob for tone adjustment. Plug and Play USB 2.0 cable, no need of driver installation. USB bus powered - no additional power cable needed. Operating system: Support for Win 8 / Win 7 / Win XP / Win Vista / Mac OSX. Item size: 34 x 10 x 3 cm. Item weight 407g. USB Cable included.