It is a removable heating socks, easy to carry, keep warm and healthy.Health‑care fever socks can prevent frostbite very well in winter.It ensures that your feet are warm and comfortable. It is the perfect solution for arthritic feet and long‑term cold feet and stiff joints.Easy to use, high heating and strong thermal insulation performance.Full power and long-lasting battery life, the rechargeable lithium battery can be fully charged and can be used for 6-7 hours.Comfortable to wear and keep your feet from getting cold, for both men and women.Specification:Product name; electric heating socksProduct material; cottonProduct voltage; 5VBattery voltage; 3.7VProduct weight; 99.2GProduct thermal energy; 35- 55°CLithium battery energy storage: 2200mAhFever time: 3-6 hours availableCharging time: about 3.5 hoursPackage List:1 x Pair of Socks2 x Battery Box1 x ManualNote:It can be washed by hand. When washing, remember to put the charging plug in your pocket and remember to take out the battery.Please allow 1‑3cm error due to manual measurement. Thanks for your understanding.