An improvement over its predecessor, the PSR-160, the keyboard has been extended to 61 full-size keys from 49. It also features MIDI in and out, 100 AWM voices, 100 AWM rhythm styles with full accompaniment (sixteen-note polyphony), and a DJ button that accesses special dance voices. It also offers a wealth of support for learners: Yamaha's Education Suite 2 (with lessons and grading), multi-fingering auto accompaniment, 100 "one-touch" settings that select the best voice for any musical style, 100 built-in songs you can learn (song book is included). Music rack, headphone jack for private practice, and an onboard 2-speaker stereo system with bass ports for big low end. Uses six D batteries (not included).