Product name: Warm earmuffs Charging state: the digital flashes when charging, and the digital does not flash when fully charged. The charging time is 3-5 hours Material: Delicate skin friendly with velvet lining + warm woolen fabric soft and comfortable warm + embedded elastic memory silk Battery capacity: 3000 mah Duration: About 5-8 hours Enter: DCSV/1A type-c Charging port Power: 5w 3-speed adjustable temperature display: the earmuffs are heated at 45, 50 and 55 C. 3 seconds heating, can be adjusted according to your requirements. When the temperature is too high, it will automatically shut down. For outdoor workers: to prevent freezing of ears in cold weather. With this earmuff, it will protect your ears in extremely cold weather. Ideal for winter outdoor activities such as walking, running and cycling. Built-in rechargeable lithium battery: Our heated earmuffs warm your ears better than traditional earmuffs, with a built-in 3,000mah battery for constant heat. Easy to store: Our earmuffs are foldable. You can keep it in your pocket or bag when not in use. This is the perfect gift for friends and children.