3 Levels Adjustable Feet Warmer Elasticity Thick Heated Stockings 40-50c Electric Heated Socks Heating Equipment Unisex Cotton Specification: Material: Cotton Height: 34-45cm/13.4-17.7inch Leg bottom: 20-30cm/7.9-11.8inch Heating temperature: 40-50C Heating position: stockings: instep & sole & knee Applicable people: unisex Specifications: feature: 1. Intelligent control infrared heating heating socks, suitable for long-term cold feet. 2. The embedded heating element helps to concentrate the heat on the toes and prevent the feet from getting cold. 3. Three levels of temperature adjustable: 38~45C, 46~60C, 55~70C 4. Soft skin-friendly fabric, dense knitting, breathable, water-absorbent and quick-drying. 5. Thick elasticity, free size. 6. Lithium battery heating with large capacity lithium battery, convenient heating, continuous warmth 7. It is suitable for skiing, ice fishing, hiking, mountaineering and sports in cold areas, and can also be used in wet places. heating method: 1. Lithium-ion battery power supply (Without battery) 2. The sock interface is directly connected to the battery, plug and heating Package Included: 1 pair of electric hot socks(without battery) Notes: This product is shipped without batteries. Buyers need to purchase a power bank with a DC3.5*1.35mm hole before it can be used, or USB to DC3.5-1.35 power conversion cable