Professional Studio USB MIDI Keyboard. 25 full size keys (non-weighted) - 4 Octaves, Pitch bend and modulation wheels, 9 assignable faders, 8 continual rotary function knobs, 8 rubber piezo drum pads, 6 assignable transport buttons, 5-pin DIN MIDI In/Out, 2 assignable footswitch jacks, 6 velocity curves to choose from Runs on 9v AC power OR USB power, USB interface, adaptable to USB 2.0.. Compatible with Win 7 / Win XP and Mac OSX Dimensions: 32 x 6.5 x 27cm. Weight 1,2 kg. Worlde have made this the ultimate do everything MIDI controller by giving the user complete control over the internal software of the controller. You can map every knob, button, key, or pad to any MIDI signal. In addition you can choose from 6 different velocity curves for the keys, so you can customize the playability to your personal playing style. You can also customize many other software settings as detailed in the manual.