Ultra High Visibility -- Powered by a small button battery, and the LED lights and light transmission polymer provide extremely high visibility for dusk and night activities. The brightness is much higher than the glow of the dark glow sticks. This means more safety for you, your children or your pet from careless and distracted drivers Three lighting modes -- The light strips has three lighting modes: fast flashing, slow flashing, always bright mode. Just one click to control. Suitable for all your favourite outdoor sports, such as cycling, jogging, running, camping and walking Free adjustable size -- The running reflectors, which have a length from 28 to 32 cm, is adjustable, it is suitable for most men, women and children. You can wear them on your wrist, ankle and arm. Quick to wear and very lightweight, with good quality and comfortable material, the jogging light bands are the ideal complement to reflective things, perfect sports accessories Replaceable batteries -- powered by two pieces of CRV2032 lithium button cells, the led bracelet can work about 60-80 hours. Normal use for 2-3 months, battery can be replaced by yourself, we give you 4 extra batteries 100% SATISFACTION QUALITY GUARANTEE -- We guarantee a full refund within 60 days and a 12-month warranty period. And we are committed to answering all questions about product and service. We provide fast and satisfactory customer service, so you can buy with confidence