What does the X mean on the light? Donna Post October 27, 2016 19:48 Updated Design feature-helps show where the on/off button is. It is also how to adjust through the different modes Related articles Riding with the Lights Intelligent Features/Modes What is Lumen? Are Kryptonite front and rear lights waterproof? How do I know if I’m covered by warranty? Comments 0 comments Article is closed for comments.