If nocturnal safety is a major concern, or your daily bike commute takes you through less savory urban locations, you might consider mounting a Portland Design Works Danger Zone bicycle taillight to your bike's seat tube. The Danger Zone is aptly named; the tail light was designed to provide a brilliant and startling display of flashing red illumination in the dark of night, in inclement weather, or anytime you want people to know that you are there. In short, every bike needs a tail lamp, and the Danger Zone is a superior product to illuminate your bike from the rear.
Two 0.5 watt red LEDs
Three modes (one steady & two flashing)
Seatpost and seatstay mounts
Up to 50 hours runtime
Two AAA batteries (included)
34 mm x 34 mm x 71 mm
Weighs 2.0 ozs. (7 grams)
The Portland Design Works Danger Zone bicycle taillight is your 2-wheeler's equivalent of the warning flashers on an emergency or police vehicle. Designed for the same purpose, it will greatly illuminate the night around you in a way that simply cannot be ignored.