The Alesis Concert is a full-featured digital piano with 88 full-sized semi-weighted keys with adjustable touch response. The Concert features 10 realistic built-in voices: Acoustic Piano, Bright Piano, Electric Piano, Harpsichord, Drawbar Organ, Church Organ, Synth, Strings, Bass and Clavi. Customize the voices by combining any two at once in Layer Mode for a full, rich tone. They can also be assigned to only the left or right hands in Split Mode. You can even add adjustable Reverb and Chorus to further tailor your sound. With powerful 20-watt built-in speakers and a 128-note maximum note polyphony, Concert delivers ultra-realistic sound with great playing experience. The Alesis Concert 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. Concert also features a 6.35mm headphone output which mutes the internal speakers for convenient, quiet private practice. In addition to the 6.35mm sustain pedal input (pedal included) and the 6.35mm stereo headphone output, Concert also features stereo RCA outputs to connect to a recorder, mixer, amplifier or other sound system. Concert also features a USB-MIDI output for connecting to a computer and using educational software or virtual instrument plugins. Concert can be powered using the included power supply or by 6 D Cell batteries (not included).