time to run Twin Pack High Visibility Reflective LED Safety Running, Cycling & Walking Armband Pack of Two High visibility yellow strap with four LED's for additional safety. Ideal for running, walking, cycling and all outdoor activities Velcro adjustment to fit all sizes and fastening to either arms, legs, rucksack, bum bags, saddle stems etc-soft terylene backing for comfort when worn directly next to the skin. Two modes, flash and static. Replaceable CR1023 batteries-battery life of up to 1,000 hours when on flash mode. High visibility yellow strap with four LED&#039;s for additional safety. Soft terylene backing for comfort when worn directly next to the skin. Velcro adjustment to fit all sizes and fastening to either arms, legs, rucksack, bum bags, saddle stems etc. Two modes, flash and static. Replaceable CR1023 flat battery. Up to 1,000 hours battery life on flash mode. (Dependent on air temperature. Lower temperatures reduce battery performance.) No quibble 60 day returns.