Review on Enhance Bike Safety with Volcano Eye Bike Tail Light: Ultra Bright Waterproof LED, USB Rechargeable, 7 Light Modes, Fits All Road and Mountain Bikes by Rob Jimenez

It's really VERY bright and great for getting noticed, especially at night. Despite having mine mounted on the back of the helmet, I find it quite easy to use, although I have to count how many switch presses I choose to select my preferred preference. It's easy to get used to. The only issue that came up (hence only 4 stars) was that the green color stopped showing (after my reset period of course!) no matter what setting it was showing (solid and blinking combinations). I think the cause is a loose board connection as sometimes the green color shows up momentarily with a certain push/light spin, or even just randomly. Too bad because the green light is the brightest of the three colors (blue and then red) when used on a handwalk. So definitely crap! Charging is pretty quick. The battery isn't dead yet, so I can't say how long it will last. I drive at night about an hour after sunset to give you an idea. Of course, this is a great bike taillight. But as others have pointed out, quality is not the best feature. The only problem I have is that the green color doesn't show up (see above) and nothing else. If not for my problem, I would very much recommend it!