Features:- High-quality fabrics: The outer front is made of skin-friendly and soft polyester wool fabric, which is anti-wrinkle, non-ironing, and non-balling. The back is made of long-staple cotton fabric and the interior is filled with cotton for double warmth.- USB powered: The scarf has a USB socket inside the invisible zipper and is equipped with a BMS power management system for real-time monitoring and feedback of the heating film temperature. This allows for precise control of the temperature, ensuring comfort for the human body.- 3 temperature adjustment: With 3-second quick heat and 3 temperature settings (40~50℃), this USB heating scarf is energy-saving, constant temperature, and safe from explosions.- 3 styles available: Choose from 3 colors - pink for a warm feeling, light gray for a neutral all-match, and dark gray for a low-key calm. The one-key switch allows for easy temperature adjustment and efficient warmth.- Winter warm: The scarf transfers heat energy to the deeper parts of the human body, promoting blood circulation and providing intelligent constant temperature. It is also radiation-free, energy-saving, and electricity-saving.- Washable: The USB comes with a waterproof cover, making it easy to wash and reuse. Simply plug it in again after it is thoroughly dried.Specifics:- Material: Polyester fiber wool + long staple cotton + cotton- Temperature control range: 40~50℃- Controller grade: 3- Rated voltage: 5V- Rated power: 6W- Power bank output: 5V/1A- Product size: 85*10cm/ 32*3.93'- Color (optional): Dark gray, light gray.