Product Information:1High Temperature: The temperature can be as high as 50C through the nano-composite fiber heating, the nano-composite fiber heating wire quickly heats up about dozens of filaments.2Adjust the Level Comfortably: Adjust the temperature according to your needs. The 3 LED lights of the lithium battery flash when charging, and the 3 LEDs are always on when it is fully charged. It can be used for 6-7 hours.3invisible Technology: Built-in non-marking heating system. Through innovative invisible knitting technology, socks are more beautiful, more comfortable, more uniform and more warm, practicality is fully improved, high elasticity, high ductility, double-layer thickening and velvet. We start from the length of the foot, the width of the toe, the length of the sock tube, and the width of the sock mouth to achieve high tensile strength, you will no longer be afraid of the size of your feet. Suitable for tall, short, fat and thin people and can be worn by men and women.4Waterproof Treatment: No fear of washing, just take off the battery. The socks adopt waterproof treatment for the power interface.5Suitable Occasions: Rechargeable lithium battery heating socks are suitable for cold weather projects or winter outdoor sports, winter skiing, hunting, camping, riding, motorcycles to keep warm.instructions for Use:1. Put on the socks, put the battery in your pocket, and connect the battery to the power cord.2. Long press the button on the battery to start heating, and the socks will heat up immediately.3. When the battery power is less than 20%, the battery light flashes.4. When charging, when the battery power is 0~29%, the battery red light flashes, and when the battery power is 30%~69%, the battery blue light flashes. When the battery level is 70% 99, the battery green light flashes. When fully charged, the battery green light will stay on.5. When the battery is empty, press the battery button, the battery light color represents battery capacity, red represents 0-29% power, blue represents 30% to 69% power, and green represents 709% 6-100% power.Specification:Name: Electric Heating SocksColor: Black \ GraySize: free size (the socks are elastic and can be stretched)Product voltage: 5VBattery voltage: 3.7VBattery capacity: 2200MAH// 4000MAH optionalHeating temperature: high-level to 50 degrees Celsius, 3 indicator lights; mid-level 45 degrees Celsius , 2 indicator lights; low-level 40 degrees Celsius and 30 degrees CelsiusCharging time: The battery needs about 3.5 hours to fully chargeWithout battery Packing List:1 x Electric Heating Socks only With battery Packing List:1 x Electric Heating Socks1 x Rechargeable Lithium Batteriess