Stay safe on your nightly commute with the Portland Design Works Danger Zone Tail Light. The tail light features two Nichia brand Japaenese Red LEDs housed in a water-resistant case with three strobe settings to keep you visible while you're on the road. It's powered by two batteries (included) and lasts 15 hours on steady and up to 50 hours when blinking. The system easily mounts to your seatpost or seat stays, and Portland Design Works includes a backpack clip for additional mounting options.