X6 pro 61 full size semi-weight velocity keys, 9 editable knob controllers, 8 editable bottom controllers, 5 editable transport controllers, 8 velocity drum pads， and build-in 128 high quality GM standard tone, is a trans-boarder MIDI keyboard especially design for arranger s, creators or live performers. USB interface, damper pedal interface, expression pedal interface, MIDI In, Midi Out, 2 balance output interface, a stereo headphone ourput interface ( front panel)USB plug and play, no need extra driver and external power.