This Light Up Green LED Armband for Night Safety is amazing for bike lovers and runners out there. Made for style and safety, the lone runner or bicyclist can feel safe on a dark road because not only does this product shine, it flashes fast and slow. Great for late night hikes, bike rides or late night jogs. LED: 1 Green Strip LED Functions: Steady Light, Slow Flash, Fast Flash Dimensions: 6.5 in. long ; 1.75 in. wide One size fits all Includes 2 Replaceable CR2032 Batteries