Working principle of foot warmer

Graphene electric heating film technology. This is a common technique for foot warmers, which involves applying electricity within an electric heating film, causing carbon atoms to collide and generate thermal energy, which radiates outward in the form of far-infrared radiation. 
PTC material technology. The electric heating element used in foot warmers is usually made of PTC material, which has the characteristics of high efficiency and safety. It can generate heat when current flows through it and has temperature control characteristics. It can automatically adjust the power to maintain the set temperature range. 
Hot water circulation technology. Some foot warmers generate heat through the circulation of hot water, and the heat generated by the flow of hot water from the waterway is transferred to the heat sink through the waterway wall, and then to the panel, thereby achieving heat dissipation effect. 
Large area heating plate technology. By setting a large area of heating pads on the soles of the feet for heating, combined with a well insulated "foot feel package", it provides a uniform and comfortable warm experience.