Midiplus X-4 III, USB-MIDI Keyboard, 49 Standard size (semi-weighted) velocity-sensitive keys, 4 Assignable knobs, 6 Assignable buttons for transport functions or MIDI-CC commands, 1 Clickable multifunction knob, Pitch and modulation key bar, Octave and transpose switches, Built-in Smart Scale mode - 16 scales, 1 Sustain pedal input: 6.3 mm jack, 1 Expression pedal input: 6.3 mm jack, 1 MIDI output: 5-pin DIN, 1 USB Type-B (Class Compliant), USB bus-powered, Robust metal housing, Dimensions (W x D x H): 782 x 193 x 87 mm, Weight: 3.5 kg