A. Three heating levels: This electric heating cap is equipped with a smart three - level thermostat that can provide a suitable temperature according to your needs. You can freely adjust the temperature settings by pressing the on/off button. B. Fine craftsmanship and a good style. C. Soft fabric cap: The heating cap is made of polyester fiber + material, which has ventilation and heat - insulation functions. It can resist the cold from the outside and lock in the internal warmth, providing warmth for your head in winter. D. Fast - heating cap: The heating cap uses heating technology to achieve fast and stable heating on both sides of the ears. The ultra - light, ultra - thin, and ultra - soft heating sheet can continuously heat for about 4 hours. E. It is recommended to turn on the highest heating level in the first 3 - 10 minutes and then switch to other levels. F. Color: Black G. Material: Polyester fiber + H. Package contents: - 1 heating cap (excluding the power bank) I. Only the above package contents are included, and no other products are included. J. Note: Due to light reflection and different displays, the color of the item in the picture may vary slightly from the actual product. The allowable error for the size is around ±1 - 3 cm.