X mini MIDI keyboard has a lot of features and is easy to use. With USB connection, you can enjoy making music whenever you want to. ◎ X3 mini MIDI keyboards which have 37 weighted keys respectively. ◎ x mini MIDI keyboard is hot Plug supported. No driver is needed. ◎ it is powered by USB and no external power supply is needed. ◎ product specifications key: 25 force sensitive keys display: 3-digit LED display buttons: shift, octave/transpose, customizable playback buttons knobs: T1 to T4 customizable knobs jacks: USB, MIDI out, sustain pedal, dimensions: 409×137×51(mm) gift-box: 480×190×90(mm) weight: 1. 7(Kg).