Air Swimmers are inflatable, helium-filled remote controlled fish that “swim” through the air. The use four AAA batteries (three in the controller and one in the fish) to fly indoors for more than 4 hours.
Although the promotional photo above looks cheesy, in the video below they look exactly like what you’d expect a sharks swimming through the air to look like.
The Air Swimmers are available from the William Mark Corporation for $39.99.