The Eneloop Kairo is a rechargeable battery-powered hand-warmer that has two preset temperatures: 39 and 43 degrees Celsius. The battery lasts 5 and 7 hours – which is fairly good for a heating device. It takes three hours to charge the Kairo, then you can put it in your pocket (44x25x121mm) then you can go out there, knowing that you hands will be warm and ready to rumble on your PSP or DS console.
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