Sigma Hiro

Sigma's Hiro Taillight sports 1 high-powered, half-watt LED that is visible from up to a mile away. It offers 220 degrees of visibility so cars approaching from the side will see you. This little powerhouse has a run time of up to 60 hours on the included 2 batteries, as well as a two-stage battery life indicator so you can keep track of how much power you have left. And, it's water resistant.