The Casio Celviano line of pianos has been refined for those who demand an authentic grand piano experience. The Casio AP-420's traditional design houses stereo grand piano sounds and an enhanced "ivory touch" keyboard. Every nuance and detail of your piano performance is captured using a tri-sensor, spring-less, 88-note, scaled hammer action. Plus, the Casio digital piano's 4-layer stereo grand piano sound delivers a natural, expressive, and dynamic piano experience. The Casio AP-420 features a total of 16 built-in tones with the ability to layer two sounds or split the keyboard to allow a bass sound in the left hand. Its built-in SD card slot allows you to load and save song files and the dual 20W speaker system delivers a sound that will resonate through your home. With 128 notes of polyphony, USB MIDI, duet mode, 1/4" audio outputs, and many more features, the Casio Celviano's advanced technology and sound makes the AP-420 digital piano the perfect addition to any home.