It has features with key transpose , keyboard percussion with 8 Panel Percussion, Start, Stop, Sync, fill-in, Metronome, Single Chord, Fingered Chord, Rhythm Programming function, record and play, sustain, vibrato transpose, one-key, follow, ensemble, MIC jack, phone jack and output jackBUILT-IN SPEAKER, AUTO BASS CHORDS: Adjustable tempo to increase or decrease the speed of the demonstration songs, Built in speakers invite your family and friends to listen to your music, Auto Bass Chords are marked out to help you learn .