Features 350 instruments 350 rhythms and 50 demo songs. Includes sustain to let the notes ring out. Vibrato offers distinctive tremolo sound. Recording feature makes it easy to perfect a song or compose your own. Large backlit LED screen makes it easy to use. Piano Keynote Stickers - gives visual guide to the notes you play. Simply Piano Education App - real-time feedback and makes learning to play fun like a game. 3 Teaching modes. Headphone output. Microphone input. Auxiliary input. Includes Key stickers and Sheet music stand.