Carbon warmer for hands HANDWARMER with metal casing covered with a nice to the touch velor. Powered by carbon cartridges which are sufficient up to 6 hours of heating. The model performs well in low temperatures and adverse weather conditions. Without any problem you will put it in your pocket or thanks to the included carrying case, hang on a leash.Handwarmer service is very simple - just put inside the incandescent carbon cartridge. Length of action of the heater depends on the size of the fuel sticks (possibility of breaking off smaller pieces). The heating capacity is controlled by the way of setting fire to the input, one side or both sides. It is not recommended to open the heater for the first 30 minutes after placement of the cartridge.