LightGUIDE LED arm bands provide the brightest security light for athletes and anyone who needs to be seen at night. Other lights don't compare to LightGUIDE with its proprietary reflective material in addition to the brightest LED Hi-Vision Blue light technology. From dusk to dawn, this highly visible light band will let you be seen by motorists for well over a 1/4 mile away. Each arm band is made of tough nylon, which wraps comfortably and easily around your arm or leg and secured with Velcro. A press to operate battery pack allows you to select from 3 light modes; slow flash, fast flash, and a constant light. Available in 3 sizes. Batteries included.