USB Foot Warmer/Warming Slippers/Shoes, Adopts High Technology Exothermic Material Safety: adopts high technology exothermic material and apply low voltage of 5V, safe and reliable High thermal efficiency: under ambient temperature of 5 to 10 deg. indoors, the temperature of this series of products can reach around 35 which is comfortable and warm for body in a short time Rapid temperature rise per unit time: it can reach target temperature for 5 minutes only Comfort and convenience: soft and comfortable, move easily, it shall become portable home slipper only by opening zipper and taking out the heating element inside Beautiful style design: the soft and comfortable fabric can make you or your family feel fashion and warmth immediately Quantity: 60pcs/ctn Carton measurement: 63.5 x 43.5 x 68.5cm Heating shoes, heating slippers, USB heating slipper USB Foot warmer/warming slippers