I opened it after purchase, but it's unused. It has not been powered on. I've lost the outer box, etc., so it's just the item itself, but I'm offering it at a bargain price. 32 compact velocity-sensitive synth-action keys Lightweight design for easy setup and portability USB-powered with plug-and-play connection for Mac or PC Works with iOS devices via Apple Lightning to USB Camera Adapter (sold separately) Octave/Transpose buttons allow access to the full piano range Pitch bend and modulation buttons for adding expression Reassignable volume knob for quick control during performance and recording Sustain button to emulate a traditional sustain pedal