61 velocity-sensitive piano-style keys 600 tones, 48-note polyphony, 100 arpeggiators, and 195 auto-accompaniment Rhythms 161 pre-installed tunes with NEW improved digital effects Step-Up Lesson system with 32-setting registration memory and a new, larger LCD display 6-track, 5-song recorder Audio input for attaching external equipment to the sustain pedal jack Any Mac, PC, Android, or iOS device can be connected to a class-compliant USB-MIDI port; no drivers or installation are needed. uses batteries or the included AC adapter to function.