Simply slap this bracelet against your wrist or ankle and the strip instantly curls back on itself, wrapping around the limb and holding firmly. When activated, the LED illuminates the entire 13 3/4” length of the band with a continuous or flashing light, enhancing visibility during nighttime activities. The inner plastic spring strip has a durable weatherproof nylon cover with a highly reflective spider-web pattern. Easily straightened by pressing both ends, the strip can be hung for use as a beacon. Replaceable long-life battery included. Battery run time approximately 100 hours.