The LED armband is designed to be highly visible in the and night time activities to keep you safe. It is lightweight, and flexible which can well prevent fatigue and discomfort of wearers. Easy to use it by simply slapping against the wrist, arm or angle part, it will curl wrap automatically. Suitable for running, jogging, dog walking, mountaineering and other outdoor activities. Feature - Color: Green. - Material: PVC. - Size: About 32 x 2.5 x 1cm/12.6 x 1 x 0.4inch. - Ultra high visibilty. It is designed to be highly visible in the and night time activities to keep you safe. - Lightweight, and flexible. It can well prevent fatigue and discomfort of wearers. - Made of material, the wristband is safe, , durable and odorless. - Easy to use it by simply slapping against the wrist, arm or angle part, it will curl wrap automatically. - Powered by 2 CR2023 batteries(included). You can replace the batteries by yourself after using up. - Suitable for running, jogging, dog walking, mountaineering and other outdoor activities. Package list: 12 Bracelet Reflective LED Wristbands Fluorescent Reflector Armband for Running Jogging Dog Walking Mountaineering