This light is very bright and I would say it is very useful. One thing to keep in mind is to use small 3m washers in the mount so it really fits snugly with what you're mounting it to. It doesn't attach to the handlebars of any of our bikes, but it fits nicely around the neck as shown in the picture. Once installed, there are many cables to manage and there are no zip ties to keep the cable out of the way. Charges fairly quickly, but you'll need your own powered USB port. The kit includes a USB cable to connect to the battery. This connection is proprietary when the battery and light are connected. It would be nice if the back of the battery had a more curved shape to match the attachment point. I could go back and use the remaining 3m pieces of rubber to help the battery stay where it is a little more. Overall this is a good VERY VERY bright light. Much brighter than the AAA and AA handlebar lights I've used in the past. It also includes a small red tail light which I have shown in the picture. Good for night cycling.
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