Feature: 1. Double 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. 2. 3 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. 3. USB 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. 4. Waterproof: 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. 5. Soft 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. Specification: Item Type: Hand warmer muff Material: Waterproof quilted cotton Weight: Approx. 329g/11.6oz Product Size: 39x18cm/15.4x7.1in. Package List: 1 x Hand Warmer Muff1 x Instructions Note: 1. Please set time reminder and turn off the power when sleeping.2. Keep away from fire sources, corrosive liquids and harsh environments.3. Do not be covered by other heat sources.4. People who cannot take care of themselves, infants and people who are not sensitive to heat need to use them under the supervision of their guardians.5. Keep away from moisture, water and liquid. Do not use the hand warmer muff when it is wet.6. Do not rub the hand warmer muff when it isworking.7. Do not pierce the hand warmer muff with incisive objects.8. Do not iron at high temperature,9. Use with caution for patients with serious cardiovascular disease and heart disease.10. There is no time limit for normal use, as long as you feel comfortable.11. In case of any abnormality, please cut off the power immediately.12. Do not use it on damaged skin when the surface temperature exceeds 65 Celsius degree.13. Do not expose to the sun for a long time.14. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.