[30-Second Heating] - This rechargeable heating sock uses a composite fiber heating element that is distributed throughout the foot and the top and bottom of the toes. It heats up quickly and you can feel the temperature within 30 seconds. Just touch the built-in controller switch or remote controller. Keep your feet warm and your blood circulating. It is very effective for people with arthritis, poor circulation and stiff joints, which promote blood circulation throughout the body. [7.4V 4000mAh rechargeable lithium-ion battery and 3 temperature setting controllers] - Comes with remote control and 2 4000mAh 3.7V lithium batteries, which can be fully charged in about 4 hours. This pair of heating socks has 3 temperature Settings. High red :145℉ -150 ℉ for 4-4.5 hours; Medium green :130℉ -135 ℉ for 5.5 to 6 hours; Low blue :110℉ -115 ℉ for 7-7.5 hours. Toes don't freeze and they keep your feet warm and comfortable in cold weather. [Soft breathable insulation material and double size] - Moisture absorption, quick drying, elastic, soft and durable, super moisture absorption and sweat ability to extend the service life of socks for you to add comfort, make your cold feet dry, comfortable and warm in cold days, two size is suitable for most men and women. Electric socks are great for hunting, skiing, fishing, hiking, dog walking, snowboarding, motorcycling, riding and sporting activities. Heated socks are a great choice for cold winters. Important: The battery must be paired with the provided remote control, otherwise it will automatically shut down in 10-30 minutes, please follow the instructions. 1 pair of socks, 2 3.7V lithium batteries, 1 cable, 1 remote control. If the socks do not meet your expectations or at any time you have any doubts about the quality