Tech 21 MIDI Mouse Features: Up/Down footswitches to access 128 patches on 16 selectable channels Footswitch for Search and Active modes Smooth-action actuators for easy control Large, non-glare LED display Phantom power operable via MIDI cable, or utilizes optional DC power supply, Tech 21 Model #DC2, or 9V alkaline battery (not included) Actual size: 4.5" x 3.5" x 1.5" Weight: 11 oz