Getting stuck in the cold is not fun. You may not always be prepared for winter. But you could use these Handwarmers with Smartphone Recharge to stay warm. Each of these have an emergency flashlight and a backup charger. It can heat up to 104 F degrees. This little gadget also charges your phone. It is compatible with iPhones, Androids, and Blackberry devices. The device stays warm for 5 hours. Not bad for a $40 product.