This is a great little product, not only adds visibility but also holds your pant legs so they don't become "chain food". LED has 2 settings, solid and flashing, which is my preferred mode. They stay bright for a long time, my original one is dimming now but it's at least a couple of years old. CAUTION - while the ingenious wrap-around design is convenient, they tend to fall off your leg while you're riding, I've lost a couple of them this way.
Pros: Easy to put on and bright for a long time
Cons: I've lost 2 so far
This review was written in the old system and had content requirements that are different than reviews written today.