This 9 1/2" diameter high quality UFO Flying Disc comes ready for fun. Just push the button to select from three modes: sequential flashing, all flashing, or constant on. Perfect for night time games and parties. The high-power LEDs illuminate the disc on all sides, giving a cool effect in use. Just leave the LEDs off and you can have fun with this flying disc during the daytime too! Each disc comes with 3 AG10 batteries installed that are easily replaceable.