LED Running Armband -Featuring the latest and most advanced ultra high visibility LED technology, offering up to 60 hours of battery life. -Using the latest flexible plastic technology, the adjustable Aura Running Armband fits comfortably and securely around your arm or ankle. -Next generation fabrics and weatherproofing seals mean you don’t need to worry about the weather dimming your glow. Features and benefits Lightweight & comfortable One size fits all Easy battery replacement Weather proofing seals Advanced LED lighting 2 lighting modes (continuous / flash) Up to 60 hours running time Fits around arm or ankle Requires 1 x CR2032 battery (included)