These interchangeable water tumblers can be stacked to create an endless fountain of fun water shows. Get things flowing by attaching the battery-powered spout to the side of the tub with the blue pump in the water. Watch as the water spins the propeller, creates a crazy sprinkler, and makes your floating friends bob up and down for a game of peek-a-boo. The more you fill and pour, the more delights there are to be had. Easy to operate and designed for small hands. Swiveling arm holds the bath cups for playing, stacking, and storage. Requires 3 AA batteries, not included.