Foot warming artifact USB plug-in for heating

This is a winter warm foot artifact, using high-quality flannel composite fabric, light, soft and comfortable. Power supply through USB interface, can be connected to socket, power bank, car charger, notebook computer and other equipment, simple operation, no charging or battery. It can be constant at 50-60 ℃, bringing comfort and warmth to your feet. It is a necessary warm foot for home and office in winter.