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While sunbathing, I can recharge my phone without using electricity and I have a fridge where water stays cool. When I am on the beach, I used to always look around for a charger and never manage to find any, and the water never stays cool - so it is great and has everything in it, it even has a pocket where I can put a book and it takes no space at all. It also charges on solar power which is very good for the environment.