200 Rhythms & 200 Polyphony The 88 keys music keyboard piano with 200 polyphony, 200 rhythms, 80 demo songs and dual keyboard function, satisfying various styles of performance, nice for teaching and practice. Portable Electric Piano Built-in speakers, External double headphone jacks and Powered by battery,this digital electric piano can be played anywhere and anytime. Semi-Weighted 88 key weighted keyboard,restore the touch of the grand piano keys, the sound changes with the sense of strength. Velocity sensitive keys rebound faster and reduce the sense of strength than full-weighted keys,suitable for beginners. MIDI Function This 88 keys electric piano has MIDI input/output jacks that can be connected and interacted with MIDI music equipment. MIDI input/out allows you to connect computer, perfect for music arrangement.