Is foot warmer safe

Electric foot warmer is a small household appliance used for massaging and protecting the feet and legs of the human body, as well as preventing cold and keeping warm. A foot warmer is generally composed of PTC heating elements, massage balls, heat dissipation plates, insulation covers and insulation boxes, as well as a heat conduction shield configuration connection.
The main material for the contact area of the foot warmer is high-temperature resistant plastic, some are ceramics, and some are alloy materials. The use of an electric foot warmer can provide massage, health care, heating, insulation, and physical therapy for the human foot. In warm massage, it can promote blood circulation and improve arthritis symptoms. Reading books, newspapers, or watching TV while placing your feet in a foot warmer is undoubtedly a comfortable experience. Electric foot warmers usually automatically shut off or are used in the event of a power outage, making them very safe.