Fish and Shark Air Swimmers by William Mark Corporation

Available at Learning Express stores
Air Swimmers are fish and shark shaped indoor helium-filled mylar balloons that you can maneuver in the air with a remote control. They take a single battery and can stay afloat for up to 2 weeks. The technology behind them is fairly simple. Each Air Swimmer is a refillable helium balloon that receives commands from an infrared remote. Ages 6 +.