Add some flash to your ride with Sigma's Stereo Taillight. It sports two half-watt, high-power LEDs so you're easily seen at night, even from the side. The Stereo is USB rechargeable so you'll never worry about replacing batteries again. Plus, it mounts in seconds without tools to your seatpost, seatstay or helmet, with its O-ring quick-release system!
Modes: steady and flashing
Run time: up to 20 hours