Casio LK-40 Lighted Keyboard 61 full-size illuminated keys- they light up as you play or to guide you through the melody of a pre-programmed song 12-note polyphonic; 100 PCM tones; 50 rhythm patterns 2 Built-in speakers; 1/4" lineout/headphone jack SCORE NAVIGATION SYSTEM allows connection to Internet via MIDI-equipped PC Operates on AA batteries or optional AD-5 AC adapter