The Nathan LightBender RX lets you run longer and carefree in high visibility as this comfortable low light running band straps securely around your arm or leg. This versatile accessory is great for cycling, running, or walking when it gets dark outside. Water resistance means you can stay out even when skies turn gray. Provides up to 2400 feet of LED visibility. High visibility blinking and steady light modes. Provides 3 color options. Provides 8+ hours on and 16+ hours with strobe one or two. Adjustable band. Comes with a USB cord to charge..