Rubbing your hands on the handles causes the water to jump up at specific locations in the bowl.

Read through the accompanying manual for specific instructions.

Note that you'll want to do a lot of practice with this bowl to get it to work properly. Your hands have to be very clean, and the bowl handles should be wiped with rubbing alcohol for the best performance. The bowl will sit on on a rubber mat (included) to keep it from sliding on the table.

LDL-B5. Bowl, rubber mat and instruction manual. Rubbing alcohol and cotton wipes are in the non-Major's stockroom