This Golf Ball is perfect for certain event that requires the player to turn on for a short period of time such as target range, hole in one contests and diving range activities. The ball will turn on for about 30 seconds and then turns off. Timer: 30 Seconds Battery: Pre-installed 2 CR2032 lithium batteries for up to 30-40 hours of use. To activate, strike the ball with a strong impact to activate the LEDs for 30 seconds.