1At the same time of heating, it can radiate infrared rays and promote blood circulation. 2Use alkaline dry battery, can last about 4-5 hours, lasting heating. 3Heating temperature is about 50 constant temperature, more comfortable. 4The socks have battery pockets, use location is not restricted. 5Comfortable to wear and keep your feet from getting cold, for both men and women.Condition: 100% Brand NewItem Type: Electric Heated Socks Material: Cotton and polyester Battery: 3 x AA Batteries/Battery Box (a total of 6 batteries are needed) (Not Included)Size:Battery Box: Approx.73 x 49mm/2.9 x 1.9inchElectric Heated Socks:Approx.28 x 23 x 9.4cm/11.0 x 9.1 x 3.7inchUsage:1. Before using this product, first purchase 6 1.5V AA dry battery (it is recommended to use alkaline dry battery), and each battery box contains three dry batteries. 2. After the battery is installed, insert the DC head of the heating socks into the DC port of the battery box, and turn the switch on the battery box to the ON position. At this time, the LED red light on the battery box is on, the socks start to heat up, and the heating temperature is about 50. If you feel overheated or want to keep warm, turn the switch on the battery box to the OFF position to close, that is, stop the power supply. This can be kept warm for a period of time. The heating temperature varies with the ambient temperature. 1 Pair of Electric Heated Socks2 x Battery Box1 x Manual