It can be heated directly by the charger.This electric heating shoe can heat up for a long time. A good gift to parents, children, lover and friends. Power saving, , winter must. This shoe is a size fits all for women and fits sizes 35-39. Soft sole, comfortable to wear. It also can be used as home shoes. Colour:Pink Material:super soft velvet Package Contents: 1 pair * USB Charging Warmer Foot Shoes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.