ctk-720 has 61 full-size keys, 32-note polyphony, 242 tones, 100

rhythms, 100 songs, lcd display, dual speakers, transpose and

tuning function, general midi, usb port, microphone input and

volume for sing along.

the ctk-720 includes our 3-step lesson system and 32-note

polyphony (number of notes that can be played simultaneously.) as well

as general midi (makes it possible to communicate with other midi

devices regardless of the brand.) it also includes a usb port.