A. Attention: This pair of warm shoes does not have an internal battery and is equipped with a USB interface. After preheating for about one minute, the shoes may start to heat up. When using them, it is necessary to keep charging so that they can stay warm. B. This pair of electric heating shoes can heat for a relatively long time. It uses carbon fiber with a relatively high conversion rate as the heating material and can also be directly heated through a charger. C. Specification Parameters - Product Name: Washable USB Heated Shoes - Sizes: - Pink Style: Suitable for women (Size 35 - 39) / Size G - Grey Style: Suitable for men (Size 39 - 43) - Maximum Temperature: Approximately 55℃ - Cable Length: Around 150 cm D. Package Contents: 1 pair of heated shoes