I have bought this hand warmer for a holiday in Finland, and I am satisfied on the whole. It will be warm at your fingertips, when the outside temperature is cold enough and pleasantly warm, but it is not really hot. Enough to warm your hands in your pocket, holds some time warm when you repeatedly turned on and off you have to but every evening anew charging. Compared to the charging time, the heat period is rather short, estimated one to a maximum of two hours - but is certainly connected with the outdoor temperature. Unfortunately, the hand warmer is something not ergonomic shaped - completely flat - if it were something he'd arched significantly better in the hand. Included is a black knitted shell, this but I have only used for transportation, through the shell is not a lot of heat on the hands; as well as a USB charging cable. If you want to upload directly to the socket you still need an adapter (I have to use my iPhone). Conclusion: He does what he is - warm hands - but for the price not the non plus ultra ...
