Foot warmers are a new type of small household appliances. It can be used for 3-9 hours on a single charge 10 minute. Completely solved the tedious problem of repeated hot water filling and cold water pouring in ordinary hot water bags. Its softness can enhance human blood circulation and prevent or reduce frostbite, arthritis and chronic gastroenteritis. It is recommended to choose explosion-proof design. When plug-in electric heating, if there is air inside, it will stop heating. There is also a unique sealing design that does not leak water. The foot warmer does not work within the set temperature range, such as 60℃-70℃. At this time, the indicator light goes out, the heating stops, and the temperature gradually drops. Until it is not within this set range, the lamp will be turned on to continue heating.