Function: 1. MULTIFUNCTIONAL: composite fiber heating cable is used, which can conduct heating, frictional resistance, heat insulation and physiotherapy. 2. 3 LEVEL TEMPERATURE CONTROL: Intelligent temperature control, three-level temperature control, which can meet different needs. 3. HIGH QUALITY MATERIAL: Made of high-quality cotton fiber, breathable and quick-drying, full of flexibility and comfortable to wear. 4. USB CHARGING: USB interface, easy to use, can use mobile power, mobile phone charging head, car charger, etc. 5. WIDE RANGE OF APPLICATIONS: suitable for all kinds of sports activities, it is an indispensable tool and the best gift for sports enthusiasts. Specification: Item Type: Electric Heating Socks material: cotton Battery: a pair of socks use 2 x 4000mAh lithium battery (built-in battery is provided) Application: hiking, climbing in cold places, keeping warm in daily wear Heating temperature: 40 , 45 , 50 Gear adjustment: three levels Care parts: feet Package List: 1 pair x heating socks 1 x Manual 1 USB line 2 x power supply Note: 1. When cleaning, put the power cord socket in your pocket and take out the power adapter. 2. The washing machine should be cleaned in a washing bag, otherwise the heating socks will be damaged by tight twisting of the washing machine. 1. Put on the socks: open the package, take out the socks and put them on your feet (pay attention to the front and back of the socks, do not wear them the other way around). It is recommended to put a battery bag over the outer end of the foot. 2. Connect the battery power: take the cable out of the sock and insert it into the battery hole to turn on: press and hold the battery switch button for 3 seconds, the 3 battery lights represent 3 levels (all on for high end), press again for 3 seconds to turn off .3. Adjust the temperature: When the battery indicator is on, lightly press the button to switch to the middle range. Press the button again to switch to low gear. The temperature of the socks can be adjusted according to the temperature. USB fast charging about 5 hours, working time 4-8 hours.