Feature: 1. Large Capacity Upgraded Battery: The heating socks have built-in two 3.7V 4000mAh rechargeable lithium batteries. The battery heated socks last about 9 hours, so you don't have to worry about running out of power too quickly. With continuous charging, you can even enjoy using the thermal socks for a few days without any problems, and have the freedom to go on long walks or trips. 2. Heating settings: The heating mantle has 3 heating groups. The adjustment is simple and convenient. High temperature (about 55 degrees) stage: the third light is on, heating can last for about 4 hours; medium temperature (about 45 degrees) stage: the second light is on, heating can last about 6 hours; low temperature (about 35 degrees) stage: the first The light is on, and the heat can last for about 9 hours. If you get cold during use, you can easily change the temperature at the touch of a button. 3. Machine Washable: Unlike other heated socks, this heated socks are machine washable or hand washable. Just make sure to remove the battery before cleaning. When using a machine wash, put the socks in the laundry bag and then in the washing machine. Also, you must make sure the socks are completely dry before heating them for use. 4. A good gift for a comfortable winter: Gift socks are the best heartwarming gift for family, parents and friends. You can use it in various scenarios such as home, office, school, workplace, outdoors and in your own room. Best electric heated socks for cold weather commuting, school, travel, skiing, snowboarding, fishing, biking, biking, hiking, and more. 5. Components included: socks, battery part. Product Name: Intelligent Heating Socks Material: Nylon Applicable parts: feet Heating method: electric heating Applicable scene: ice and snow sports Product color: black, gray Packing method: bag Sock weight: 200g Applicable objects: both men and women Size: One size fits all (34-44 yards) Packing list: 1 Pair x Intelligent Heating Socks 2 x Power Bank Note: 1. Due to manual measurement, please allow 1-3cm error. Make sure you don't mind before bidding. 2. Due to the difference of different monitors, the picture may not reflect the actual color of the product. Thanks.