LED Glowsticks not only provide an added element of safety to your night dive, they save money, and are good for the environment too! Gone are the days of buying and throwing away one-time use plastic, chemical light sticks. A long-lasting LED powers fourteen light-emitting fibers to brightly illuminate the glowstick. A cable lanyard with metal clip keeps the glowstick secure. Multiple colors allow you to identify your buddy as well as other divers in your party. Black chromed brass case with a dual o-ring seal. Carries a back-up tank valve o-ring (p/n VP15-B), included. Approximate diameter 0.5” (13 mm). Powered by three LR44 alkaline batteries, included. Break-Away strap kit makes it easy to mount direct to regulator first stage.