This is a "real working whistle with spinning bubble wheel," says the package. You put bubble solution into the circular part of the whistle. When you blow the whistle, the air goes past a whistle hole and then through a "wand wheel" that rotates into the bubble solution. "The more you blow, the more bubbles you get!"
The whistle comes in red, yellow, and purple. It is packaged on a card with a bottle of Koosh bubbles. Item number: 54405.