|"Make your airplane. Oooo, nice one. Then, you just slip your Electric Paper Airplane Conversion Kit($20) propeller-stalk thing onto your paper airplane." It consists of a propeller which pushes the plane from the back driven by a small motor up front. It clips to the front, with the prop sticking out the back. Recharge motor for 20 seconds using the included battery pack and the propeller will spin for 90 seconds.