The Alesis Recital Pro is a full-featured digital piano with 88 full-sized hammer-action keys with adjustable touch response. You can easily customize the voices by combining any two at once in Layer Mode for a full, rich tone by using the intuitive onboard controls and display screen. Voices can also be assigned to only the left or right hands in Split Mode. You can even add adjustable Modulation, Reverb and Chorus to further tailor your sound. With powerful 20-watt built-in speakers and a 128-note maximum note polyphony, Recital Pro delivers ultra-realistic sound with an authentic playing experience. The Alesis Recital Pro has an incredibly useful feature called "Lesson Mode." This feature divides the 88 keys into two zones with the same pitch and voice. This enables both the student and teacher to easily watch each other and play together without having to take turns or reach over one another. Recital Pro also features an easy "Record Mode" that enables you to record your playing and then critically listen back to your performance. The Recital Pro features a ¼" (6.35mm) headphone output which mutes the internal speakers for convenient, quiet private practice. In addition to a ¼" (6.35mm) sustain pedal input (pedal not included), Recital Pro also features stereo ¼" (6.35mm) outputs to connect to a recorder, mixer, amplifier or other sound system. Recital also features a USB-MIDI output for connecting to a computer and using educational software or virtual instrument plugins. Recital Pro can be powered using the included power supply or with 6 D cell batteries (not included).