Temperature RegulationThe heating sheet of the electric heating socks is placed on the front foot. The battery has three levels of intelligent temperature control, high range (red light) 55/131F, lasting 6 hours; medium (yellow light) 50/122F, lasting 8.5 hours; low range (green light) 45 /113 12 hours. Three gears can be cycled. Socks Size Heated socks are available in black/gray colors, sizes: heel and toe 20cm, heel sock opening 23cm, tube sock width 9cm/piece; the socks are elastic and suitable for more people. Socks made of combed cotton (80% cotton, 15% polyester, 5% spandex) are skin-friendly, soft, warm and breathable. Battery parameters 4000Ah polymer lithium battery, input: 5V/1.5A, output: 3.7V/2A. Applicable Scenarios Heated socks are suitable for skiing, fishing, hiking, camping, sports events, skating, family leisure and other occasions. The socks can be washed many times without deformation, and the battery must be removed during cleaning. Before cleaning the machine, place the USB connector in your sock pocket. Tip: Place socks in a laundry bag when washing. What you get A pair of heated socks, a pair of rechargeable batteries