Yamaha DGX-500AD 88-Note Touch-Sensitive Portable Electronic Keyboard with AC Adapter 88, touch-sensitive, piano-style keys Musical Instrument Digital Interface (MIDI) input and output Music database with over 200 song styles, 610 instrument sounds Sequencer records up to 5 songs in 6 tracks, 3.5-inch disk drive included Yamaha music tutor with lessons for beginners