Casio LK-43 Lighted Keyboard 61 full-size keys with 12-note polyphony; keys light when played Includes 2 built-in speakers, headphone jack LCD window (7 6x 42 mm) shows current tone, rhythm, song, volume, tempo, other features 3-step teaching system walks you through performance basics with manual melody advancement and smart accompaniment 5-part multi-timbre MIDI in/out jacks