Sparx Valve 2Cd-With Battery Tire Light, Green

I bought these for my sons neon green bike. They are very cheaply made. When I first opened the package one fell apart immediately. After reassembling it, it would not turn off (flashed for more than 10 minutes while sitting motionless on a work bench). I had to play with the level of tightness I threaded it together for a while to get it to reliably turn on and off. But at the end of the day they are working, have survived five long rides and many hours of riding around the neighborhood. Can't say how long they will hold together, but they lasted long enough to earn a sold 3/5 rating. Also note, they are larger than I expected. About the size of the medium sized Christmas light bulbs.

Purchased for use on a jogging stroller, rarely lights up. I switched to my bicycle and they are more active, but not on all the time.

Seriously bright. And turns on with ANY motion. I like that it has spare batteries, they turn on so easily that I'm sure I'll need to replace soon.

It doesn't fit road bycicle tires and it doesn't say so anywhere. Lost my money

Works perfectly. Motion or vibration.......