Material: Silicon gel, lightweight, soft, flexible and extremely easy to wear. 2 light modes: Lasting model and flashing model, can support about 80 hours. Which also could be changed easily. Multi use: Has a adjustable washable velcro strap and can be worn as an armband, on the leg or ankle, a trouser clip, attached to a bike helmet, to a backpack and much more. Suitable for jogging, walking, cycling, running and other outdoor activities need a safety light at night. Nice option for ice rink, hip-hop performances.Flashing LED lights are visible from a long distance and looks very cool, which will protect you from oncoming cars, cyclists and pedestrians.