1Double Side Fast Heating: This hand warmer muff can provide you with double side instant heating in a few seconds, and can realize fast heating just by pressing the button.23 Gears: The 3 gears heating setting is adjustable, and the working temperature is up to 65 Celsius degree. The hand warmer pouch can provide sufficient warmth to keep your hands warm in cold weather.3USB Interface: The heated hand muff is equipped with USB interface, which can be connected to the power bank for power supply, so it is also very convenient for you to use outdoors.4Waterproof: This heated hand pouch is made of waterproof quilted cottonmaterial. Do not worry about that the surface will get wet, which is safer and more practical.5Soft Material: The electric hand warmer muff is skin friendly and durable. The hand warmer muff has super soft plush finish, which is warm and comfortable.