Here's the perfect way for early morning/nighttime runners to stay safe and seen in the dark. The Nite Ize LED Marker Band is a surprisingly thin, durable polymer strip encased in sturdy nylon fabric, decorated with a reflective pattern for extra visibility. Its fully adjustable elastic band and quick release buckle allow you to wear it snugly and comfortably around your upper arm, and its efficient (100,000 hour) LED makes you clearly visible by other commuters for up to a mile away. Long-lasting, weather-resistant, and durable, the Marker Band is also great for increasing safety when working, cycling, or walking at night (excellent for trick-or-treaters), as well as generally increasing both visibility and the fun factor in nighttime lawn and party games. The bright red LED has two modes to choose from - steady glow or continuous flash. Powered by one easily replaceable 2032 battery (included).