HOW TO USE : The product must be used under the following conditions-rated input voltage: 5v~6v, rated input current: 2.1A, if it is used below the above range value, there may be abnormal phenomena, and product performance will not be affected When the voltage and current reach the standard value, the product can be normal (please pay attention before buying) .WATERPROOF & NON-SLIP: made of knitted wool and warm cotton, healthy to use, you can put on plush warm slippers and enter the bathroom without changing your shoes, the bottom is waterproof and non-slip, and the fabric has high elasticity. In a dry outdoor environment, the portable power supply can be used as a power adapter and the temperature can be controlled at the same time. .USB POWER SUPPLY: Our electric hot shoe is powered by USB, just plug it into a mobile power source via a USB cable, such as a computer, wall charger, car charger or any USB socket on the USB port on the board. .EXCELLENT CHOICE: The heated shoes will heat up quickly and maintain a constant temperature within 3 minutes, which is very suitable for keeping your feet warm when studying, working, chatting and watching TV in cold weather. The best gift for your friends and family .NOTE: This plush warm slippers suitable for both men and women need to be washed by hand. When washing slippers at home, remember to remove the heating pad. Thank you.