The Light Up Blue LED Armbands for Night Safety are amazing for you 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 fast flashes as well as slow flashes. Have a group of bicyclists or are part of a bicycle enthusiast group? Go on night runs or do marathons often? Have a bike messenger company or know of someone who loves hiking? This is the products for all of that and more. Features 1 blue LED Strip with steady light, slow flash and fast flash functions. Comes with 2 replaceable CR2032 batteries.