Great product, super light weight, highly functional highly effective. Good design considerations. The elastic rubber strap has hole positions to accommodate most any bicycle mounting part and the rubber will provide friction to prevent it from turning off its axis. Two buttons to control 6 modes can be a little annoying but you can quickly get to the mode you want. Slow blinking, fast blinking, steady, occulting, dimmer, dimmest. Bright and a quick charge from a USB C cable.
I bought a set of these rechargeable bike lights and I was so happy with them that I bought a second set. I actually attached mine to a cat stroller, and they work perfectly! They're super easy to put on and they stay in place really well, even on bumpy paths. When it's time to charge them, the light pops right off the mount with no fuss. I like that there are different brightness levels, so I can adjust them depending on the time of day. The battery life is surprisingly long, so I don't have to charge them nearly as often as I expected. The split charger is also really handy since I can charge both lights at once.
I am very happy with the battery life and quality of these bike lights. I have been using them three months. You can use them vertically or horizontally. Installation is easy and quick. There are several lighting options that range from always on to different type of strobe. There is a powerful main light and a more subdued, sublight. Both are controlled by different buttons. The main and sublight can be used together or alone. I find using only the main light is more than sufficient and helps preserve battery life. Charging is usually complete in an hour. I only have to charge after a few rides. (18-20 miles a ride. About 1.5 hours each) In the summer, I leave lights on my gravel bike in the garage. In cold weather, I bring the lights in the house so the batteries don't drain. So far, a great product and the price was very reasonable.