Looking for a practical hand-warmer, I came across this infactory with battery. Prima I thought of working with a battery hand warmer gasoline smells unpleasant, with the carbon rods to do once and then it will burn, although I might need just 1 hour and this weird kink things from gel to me personally too hot. This one has a battery, can be adjusted to different levels and could be him even when traveling by car or by spare battery, recharge. But then the disillusionment hand warmer is exactly the right word, because more like the hand slightly warm / and at the highest level, he does not. When there still wearing gloves you realize them nothing. And you put him in a pants or jacket pocket because you think that gives off heat ... well because my body emits more heat as this thing. Have it after a brief but unsuccessful attempt returned ... pity the idea with the battery and the on / off was not bad!