High visibility and reflectivity - Led bracelets are clearly visible in the dark, and their band material can reflect light. So the LED armband can prevent potential danger while walking in the morning, walking at night or walking the dog. Two Lighting Modes - The lighting strips have two lighting modes: Flash, constant light, you can choose any of them as your favorite mode when doing outdoor activities. Weather Resistant with Non-Slip Elastic Band - Racing reflectors, 20-40cm long, are adjustable, suitable for most men, women and children. You can wear them on the wrist, ankle and arm. Multifunctional Led Bracelet - The Led bracelet, with good quality and comfortable material, is multifunctional. It is suitable for many outdoor activities, eg. Cycling, jogging, dog walks, mountaineering, running, camping. Replaceable Batteries - Powered by two pieces of CRV2032 lithium batteries, the LED bracelet can work about 60-80 hours. The batteries can be replaced at low power.