The Snap Circuits Mini Flying Saucer features brightly-colored electronic components that snap onto a clear plastic base to build different circuits. With this kit, you can build a flying saucer that sends the propeller flying upwards through the air. Includes 4 additional projects: a fan, hypnotic pattern, spin draw, and strobe the house lights. Requires 3 AA batteries. Includes a colorful and easy-to-follow instruction sheet that make these electronic experiments easy and fun to build. Fun Fact The air is being blown down through the blade and the motor rotation locks the fan onto the shaft. When the motor is turned off, the blade unlocks from the shaft and is free to act as a propeller and fly through the air!