This is really neat product, especially for the low price point.Although these lights are meant for cycling on the roads, I actually bought them as backup for my son's four wheeler, which has a tail light that often shorts out. I liked the idea that this is something he could have as back up, easy to install on any rack of the four wheeler, with no wiring required. The rubber mounts that come with this set are perfect for that, allowing for easy installation and still have access to the charging port and power button.The lights themselves are heavier then I expected, appearing to be very rugged and weather proof, although we have not yet had bad weather to test them out. I did splash water against it, and that had no effect on it whatsoever. The USB cords connect tightly and securely, and when the light is not connected to the cord, the USB port on the light is covered in a way that appears to be weatherproof.The lights themselves are very bright, illuminating more and further then I expected them to. I had been thinking that they would act more like a bike reflector, especially for the price, but they cast more light then other battery operated lights I have seen. They have four different light modes, from constant to flashing, and all are very visible and effective. The charge I gave them yesterday is still holding, after several hours of constant light, then off overnight, then turned back on this morning, so I believe that the battery is strong. My son carries a solar charging panel on trail rides on his ATV, and these lights can also be charged with that, so I feel much better knowing if he is in the woods longer then expected he will have access to these lights.Although I may not be using these lights for their original intended purpose, they suit my needs very well, beating my expectations of the product for the price point. Please note, I purchased these lights at a discounted price in return for my honest opinions and review, although that in no way obligates me to give a positive review. Especially with outdoor equipment purchased for my sons, I rely on product reviews from others, and therefore give nothing but my own experiences and opinions in my own reviews.