CatEye's Blitz Auto Taillight has optic and motion sensors, so when darkness and motion are detected, your light turns on instantly! 50 seconds after motion has stopped it turns itself back off. Five efficient LEDs give you run times of up to 400 hours. It has two different modes so you can customize the pattern and run time, and it has an auto and manual setting, too.
Run times in hours: 200, 200, 400 (rapid, constant, flashing)
Batteries: 2 AAA (included)
Weight: 87 grams
Watch a video about CatEye's Auto technology.