Monoprice MIDI Keyboard Controller - Black, 49 Key | Pitch-bend & Modulation wheels, Driverless plug and play for Windows and Mac PCs - Stage Right Series 49 Velocity sensitive keys to trigger your MIDI hardware & software 4 Rotary encoder knobs MIDI Out port for standalone use Driverless plug and play for Windows and Mac PCs Powered from the USB bus or using an optional 9 VDC power adapter (not included)