The Casio PX-S3100 is a slim digital piano with 88 Smart Scaled hammer action keys, AiR Sound Source, 700 tones, 200 accompaniment rhythms, Backlit LCD display, Illuminated touch sensor controls, 192-note polyphony, Pitch bend wheel, 2 assignable knobs, Split & layer capability, Hall Simulator, Surround effect, 3-track MIDI recorder, Editable DSP effects, USB-MIDI connectivity, iOS/Android app integration, Duet mode, Metronome, Stereo speaker system, Headphone output, 1/4" line outputs, Includes ADA12150P AC adapter, music rest, SP-3 sustain pedal and WU-BT10 Bluetooth audio & MIDI adapter, Optional 6xAA battery power, Optional Bluetooth audio & MIDI adapter, Optional 6xAA battery power, Optional SP-34 3-pedal unit, Optional CS-68 stand