Knog Boomer Rechargeable USB Light
Stay noticed with the stylish and compact Boomer Rear Light. Knog's new 2011 design uses a single high powered red LED, plus an integrated lens to deliver a head-turning 30 Lumens, and keep going long after the sun sets. Super-slim flexible silicone body and integrated strap mounts to seatposts, seatstays, and more.
Small enough to stow away and bright enough to be seen on the roads. These were a great deal for a front/back pair and super easy to move from bike-to-bike.
This is a great light for a tail light, multiple flash options, or steady light, easy to take on and off and the best part is it is rechargeable and water resistant.
I use this for my tail light. It's the best option out there: -real easy to put on and take off -rechargeable, so you offset the price of any battery-powered option -has a great annoying blink that is sure to be noticed and keep you safe