It's pretty simple. Each finger thingie plays a note when you press it on a hard surface. Add three more buttons/notes on top of the wrist unit, and your Japanese Wrist-Mounted Finger Piano pumps out one full octave of fun. But that's not all. The Japanese Wrist-Mounted Finger Piano has three volume levels and three sound banks. It's the sound banks that really make this special. Sure you can play piano (sound 1) or bells (sound 2), but what sets the Japanese Wrist-Mounted Finger Piano apart from all other instruments (and makes it wonderfully Japanese) is sound 3: cat. That's right, you can play a full scale (and chords, thanks to the polyphonic nature of this instrument) of cat. Japanese Wrist-Mounted Finger Piano - a handful of musical fun!