Compact keyboard controller easily fits backpack and studio production desk (12.4" long, 1.6 lbs)</br>Powered by USB connection to computer, with free virtual-instrument download packages</br>Crammed full of all the features you need to play and edit musical ideas</br>25-synth-action mini-keys, 8 velocity-sensitive rubber drum pads with two banks, and eight assignable control knobs</br>Circumaural (closed-back) design for outstanding noise isolation</br>50mm dynamic transducer delivers deep, rich bass</br>Wide range frequency response: 10Hz-30kHz</br>Collapsible design for increased portability-includes leatherette travel pouch</br><br/>http://www.amazon.com/gp/product/B01N1GZ67O