Temperature adjustment The electric heating socks heating element is placed at the front foot, and the battery has three levels of intelligent temperature control. High-grade (red light) 55/131F, lasting 6 hours; medium (yellow light) 50/122 F, lasting 8.5 hours; low range (green light) 45/113F 12 hours. Three gears can be cycled. Sock SizeHeated socks are available in black/grey, size: heel and toe 20cm, heel opening 23cm, tube sock width 9cm/piece; the socks are elastic and suitable for more people. Combed cotton socks (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