The built-in, 2-track song recorder is a great way to capture a performance and play it back to hear your progress. You can also record the right and left hands separately for hands-separate practicing at any tempo you"re comfortable with. Now you can practice one hand, while your Arius plays the other. * 128-note polyphony * 50 classic piano songs are provided in the built-in song memory * Weighted Keys Yes * Speakers 2 x 20 Watts