Our Balloon Helicopter Party Favor toy is the perfect addition to goody bags and for indoor and outdoor party fun. Simply tie the propeller to one of the attached balloons, fill the balloon (about half way), and toss the balloon into the air. The device will magically fly up to 30 feet into the air while letting out a loud whistle. These balloon helicopters provide for hours of entertainment and even an exciting physics lesson. Reusable as often as you like with the included 4 latex balloons or by using your own.