Luminous Reflective Wristbands: Our reflective LED wristband provides 360 degree high visibility during dark and nighttime activities. The rechargeable LED wristband not only provides safety guarantee for adults' night sports, but also brings light and safety to children going to school in cold and dark winter USB Rechargeable: Our bracelets come with rechargeable batteries. It can provide 8 hours working time with 30 minutes quick charge, enough for you. Convenient, user-friendly and economical One size fits most: This LED wristband weighs only 30g and measures 35cm x 4cm, suitable for adults and children. The waterproof design can protect your bracelet from splashes from any angle 3 lighting modes: There are three lighting modes, fast flash, slow flash, always bright. You can choose the mode according to your different needs Auto-scroll bracelet: Our bracelet can be scrolled automatically, just one step to wear it, very convenient. It is suitable for running, walking, cycling, climbing, hiking, jogging and other outdoor activities.