The PSR-E353 is jam-packed full of incredible instrument Voices, accompaniment Styles and fun features. It's an ideal Portable Keyboard for beginners and hobbyists, featuring touch sensitive keys, on-board lessons, computer and mobile device connectivity and much more. Features: Touch-sensitive keys add dynamics to your playing. Play lightly and the sound is soft. Hit the key hard and it's loud. The Aux Line Input allows you to connect any music device with a headphone output, such as an MP3 player, a computer, a mixer or even another keyboard, and hear it through the internal speakers. Melody Suppressor isolates the melody of audio songs connected to the Aux Line Input jack and reduces the volume allowing you to sing along or play the lead. Yamaha Education Suite (Y.E.S.) allows you to practice using the preset songs (or MIDI files on compatible instruments) at your own pace, one hand at a time, or both together. The USB to HOST port allows you to connect and interact with a wide variety of educational, music creation or music entertainment applications on a computer or mobile device Accompaniment Styles add a "backing band" to your performances while you remain in complete control of chord changes and arrangements. The Arpeggio function intelligently creates melodic and rhythmic patterns based on the notes you play, adding inspirational and expressive musicality to your performances. Duo mode splits the keyboard into two halves, each with their own "middle C" for practicing with a partner