Air Swimmers swim through the air with incredibly smooth and life-like motion. These amazing fish provide hours of remote control indoor fun in even the smallest of rooms (not for outdoor use). They require only four AAA batteries (one in the body, three in the controller) and have complete up, down and 360 degree turning control. Simply fill your Air Swimmers with helium, available inexpensively at any party store, florist shop, or grocery store that carries balloons. The body is made from a high quality, durable nylon material that will stay inflated for weeks! You can fill it again and again. Remote control has never come to life so magically!