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Very satisfied with this product. Use it every day on Denali. This means it was quite exposed to different elements: I had to stuff it in my backpack with other things, rain/snow drizzled on it, very cold at night, etc.. Never stopped working. Given the three outlets more people of our expedition came to me to use my charger since it was the most reliable one. The holes on the edges and the carabiners that come with it make it very easy to attach it in a way that it can soak up a lot of sun (see picture).