Night Eagle CV LED Golf Balls - Light Activated - No Timer - 6 Pack To activate you touch a strong light source, such as the light from your smartphone camera, to the printed circle on the ball. No Timer! Don't loose your ball before you get to it. Ball turns off when you deactivate it! Approximately 30 hours of continuous use. In most cases the battery outlasts the ball! High quality 3 layered golf ball A choice of 5 'stand out' colors