Feature:1. 1. The heating cap is made of soft, breathable and quick-drying material, which is comfortable and elastic. The fabric is a knitted fabric, which makes our heating caps softer while still maintaining maximum warmth.2. 2. The advanced heating element is designed to stimulate blood circulation and heat the head and neck in just 30 seconds. Electronic hats and snoods are great gifts for Christmas, birthday and Valentine's Day. Very suitable for all outdoor activities in autumn and winter.3. 3. It adopts an electric heat conversion heat conduction module, USB connection hat and scarf heat at the same time, compatible with a variety of devices, can be connected to cars, computers, power banks and all with USB charging devices.4. 4. The hat is very suitable for various recreational activities such as hiking, fishing, skiing, biking, and motorcycle riding. They are very suitable for outdoor work or for walking dogs in cold office buildings. Especially suitable for participating in picnics, outdoor sports events and school competitions.5. 5. Two ways of use: it can be heated in winter or used in autumn without heating, multiple options.Specification:Voltage: 5VHeating material: adopts electrothermal conversion heat conduction module.Temperature: 40-50 degrees.Size: one sizeOne set: 1 USB cable + 1 hat + 1 bib (2 sets)Package List:1*Hat1*BiNote:It can be washed with water, dried in a cool place, not exposed to the sun or baked.