Size:31*12cm Material:Material Power Source:Battery Powered Battery Description:Lithium-Ion Included Components:Battery Reusability:Rechargeable Item Package Dimensions L x W x H:11.5 x 11.5 x 3.7 inches Package Weight:0.34 Kilograms Item Dimensions LxWxH:10 x 10 x 10 inches Suggested Users:womens Sunfenle - Material: polyester fiber + pearl cotton Size: 31*12cm Temperature adjustment: Low grade: 35-40 Mid-range: 40-45 High-end: 50-60 Package included: 1*Electric heating shoes 1*Temperature time controller Warm material: a new type of elastic and warm polyester fiber material, soft to the touch, even if the power is not turned on, the whole will feel warm.It can be worn in cold weather to solve the problem of cold feet and avoid cold. This is a heater slippers with a built-in carbon fiber heater, which will warm up immediately when powered through the USB port.Sunfenle . Three-level temperature control: Compared with ordinary electric slippers, we have a controller that can heat the temperature from 35 degrees to 60 degrees in three stages, so the temperature can be switched according to the place of use and the surrounding temperature. Since it is heated at a constant temperature, it can effectively prevent overheating and overcooling. Please check before use and make sure 5V/2A. Time can be set: The time with three-step timer function is 60 minutes, 90 minutes and 120 minutes. This is a USB foot warmer, you can use it with confidence, because the power will automatically turn off after a period of time, which is very safe and saves energy. Washable: When you want to wash your house slippers, please remember to take out the heating pad, you can wash it completely after taking it out. The heating pad is also put into your other shoes to keep your shoes dry and comfortable..Sunfenle USB power supply: Our heated slippers use USB power supply, just connect the USB port on the portable battery, computer, wall charger, car charger or any USB plug, which is easy to use. The length of the power cord is 1.5 meters, you can walk indoors without the help of an extension cord, so it is very convenient to move. The wire comes out from behind the slippers, and the direction of the two zippers can be adjusted 180, so it will not interfere with walking.