Yamaha PSRE353 Touch Sensitive 61-Key Portable Keyboard Bundle with Knox Double X Stand and Yamaha Survival Kit B (Includes Power Supply and 2 Year Warranty) 61 touch-sensitive full size 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, Melody Suppressor isolates the melody of audio songs Over 500 Instrument Voices, Over 130 Accompaniment Styles, Dual Mode, Split Mode and Harmony, Music Database, Your Tempo & Song Master Lesson Modes, and Backlit LCD. 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. The Arpeggio function intelligently creates melodic and rhythmic patterns based on the notes you play, adding inspirational and expressive musicality to your performances.