Activate by touching a strong light source, such as the light from your smartphone camera to the printed circle on the ball. Upon sensing the strong light, the computer will automatically turn on the LEDs. Once the LEDs are activate they will continue to emit light until another strong light is sensed. There is no timer inside our LED golf ball, once activated it will stay continusly lit until turned off. Assorted LED Golf Balls were designed with the professional golfer in mind. You can expect the play ability, performance, and control of a real ball with an added glowing bonus! Green LEDs 1 Ball Per order.