The Yamaha PSR-E333 61 Key Portable Keyboard features a total of 497 quality voices (including sound effects kit) and up to 106 accompaniments to play along to. The PSR-E333 also features 61 touch-sensitive keys, Built-In Speakers, a headphone jack and 2-track song recorder. Yamaha's Y.E.S. and Keys to Success features make the PSR-E333 an ideal keyboard for learning how to play. The keyboard runs on batteries or an external AC power supply (sold separately). A music rest is included.