Roland HPi-6s Digital Interactive Piano The next-generation PHA II (Progressive Hammer Action II) Keyboard with Escapement Authentic grand-piano sound by 88-key stereo multi-sampled waves and a 4-speaker sound system Newly designed space-saving cabinet with front legs Wide, easy to read color screen built into the music rest enhances Roland's unique DigiScore notation A wider variety of educational games including Roland's acclaimed "Wonderland" for fun and interactivity in the learning environment Twin Piano mode enables teacher and student, parent and child, or a pair of friends to practice and perform together 50 sampler songs from the internationally acclamed Microjazz catalog Audio song playback in any key for play-along fun: wav file from a USB memory key or audio CD with optional USB-CD drive DH-01 Holder for External CD Drive: DH-01 is an optional mounting bracket for attaching a commercial CD Drives sold separately