Electric heating wire-type hand warmers, stable, high thermal efficiency, safe and convenient to use, relatively slow heating, electric heating wire wrapped with insulation material to heat the liquid; hard-shell rechargeable hand warmer, safe and convenient to use, relatively short heat release, by heating the internal heating plate to achieve heating. There are many kinds of hand warmers, such as electric hot water bags, disposable hand warmers, liquid hand warmers, lithium battery hand warmers, and so on. Disposable hand warmers and liquid hand warmers are physical and chemical exothermic, do not require charging, and are unlikely to have radiation. When the water temperature rises to the set temperature, the electricity will be cut off. The heating principle of the hand warmer is that an electric heating device is built in the middle of the conventional hot water. As long as it is electrical equipment, work will have radiation, but the radiation dose is very low, with no harm to the human body. After power failure, hand warmers and ordinary hot water bags are no different, will not electromagnetic radiation, so work to use with ease.
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