The PSR-E463 61-Key Touch Response Portable Keyboard from Yamaha is an entry-level keyboard for performing various styles of music. It features on-board speakers and easy-to-use professional features such as assignable live control knobs Quick Sampling Groove Creator and a USB audio recorder. The library of 758 instrument voices and 235 auto-accompaniment styles allow you to enjoy playing any musical genre. Change sound on-the-fly by switching the effect destination. There are two assignable real-time control knobs that let you filter and adjust your sound like an analog synthesizer. The 10 DSP effects can be assigned to the knobs and controlled for dynamic expressive live performances. A pitch bend wheel adjusts the pitch of guitar sax and trumpet sounds to bring them to life. Finally you can record your performances to a USB flash drive and the built-in USB to device terminal on the instrument lets you load and save your settings as well as transfer the data to your computer. A music rest is also included. This keyboard runs on 6 AA batteries or an AC adapter not included.