Casio 61-Key Portable Keyboard w/ Stand - Black - CTK-720/STADV Instrument Size: 3/4 Keyboard and Piano Features: Portable, MIDI Interface, Volume Control Slider Tones: 242, Keys: 61 Accompaniments: 100 Demo Songs: 100 Maximum Polyphony: 12-Note Maximum Polyphony Speaker Size: 2.0 &#34; Input Type: Audio Jack Output Type: Headphone Jack Instrument Body Material: Plastic Includes: Microphone, Instruction Manual Warranty Description: 1 Year Limited Manufacturer Warranty on Parts and Labor