7Buy One Pair Plush USB Electric Heating Slippers Shoe Keep Foot Warmer for Winter Cold Weather Fits most US size 5-11,Sole Length:30cm/12inch,keep feet warmer in this winter.If you have any product problem,please first contact us,we sure help you solve before leave any unsatisfy words. Made of carbon fibre heating element,healthy for use and low power 5V. Product Adapter Voltage 3V-6V safe voltage, power 0.5W heat to about 42 degrees, constant temperature. Washable,with the EVA independent fever insoles. Connect convenience,usb plug,such as PC,notebook,power bank,or power transformer.