Package Included - 2 pcs heated soles, 2 pcs battery box, 1 pc USB, 2 pcs leggings, 1 pc instruction manual (battery not included). Heated insole, even heating, low tension, safe and energy-saving, fast heating, soft and comfortable. High quality material - The thermal insole is made of flannel + carbon fiber heating film + EVA insole material. The thermal sole provides warmth for everyday use and is ideal for keeping the body warm in cold temperatures. Size information - Thickness: 5 mm Size: 36-47 (can be trimmed to size) and cannot be trimmed within size 35. You can usually clean the shoe warmer with water. It is best not to soak the USB in water and use it after drying. Multipurpose- The USB is suitable for home and office, etc., and the battery is suitable for outdoor sports, etc. Battery Box: 3 sections with 5 sections DC35 battery box (Battery not included). Perfect for keeping your feet warm in winter. The default output for the heated sole is 4.5V. If the home charger or power bank can"t reach 2A, the heater may not start. WIDELY USED - Any kind from winter sports (skiing, snowboarding, etc.), working outdoors in cold rooms or on cold days, for police and army operations, rescue workers, etc., cycling outdoors, cold at home, etc.