Three modes: fast LED flashing, flashing, and constant on. Plus, it's USB rechargeable. Perfect for commuting to school or work!!! For jogging, walking, running, and walking your pet... To prevent nighttime accidents, please have your children wear them. Great for nighttime safety on the way home from cram school or club activities. A must-have for those weeding along roadsides. You can't be seen by drivers when you're crouching in the dark. You can feel safe having your children wear them when camping. In some places, it's so dark that even adults feel fear in the darkness! Being able to visually confirm "I'm here!" "I'm here!" "I'm here!" leads to accident prevention. Please understand that there may be some measurement errors. Discounts are not being considered. #ledkyotoshi