This product would be fantastic if it was user-friendly and had instructions that were comprehensive.
It was easy to mount on the bike.
It is very bright, but it took some time to figure out how to get it to work. Once that was working right, it was great. But after about 10 days or so, when it was turned on to use, it had no power. That just happened. It's new, so it should have a strong battery. It has one of those small round batteries and does not have a USB charger. It does not have an off/on button at all. Like I mentioned, there are no intelligent instructions to help with this issue.
It the battery power had not gone out, it would be a 4 star. Reason: No intelligent instructions and no USB charger.