Expressive and Responsive Weighted Hammer Action keypad for an acoustic piano feel and touch Deep and Rich three layer grand piano sample for true realistic grand piano sound 16 different instrument voices with customizable effects and 3D stereo instrument samples USB to Host and class compliant USB connectivity, MIDI Out, Stereo Line In and Out and more Portable, works on Batteries or Adapter plus includes both the Sustain Pedal/ASP-3x3M and Power Supply