Winter head warmer is made of a knitted heated winter hat, soft and comfortable, perfect for sports and daily use Includes hat and scarf in gradient color for style adjustment and to keep warm USB powered: the heating that can be powered by your PC, power bank, car charger, etc, The 40-50℃ winter warm electric heating that provides the right temperature for everyone This thermal cap is perfect for skiing, snowboarding, snowmobiling, snow shoveling, motorcycling, mountain climbing, hiking, hunting The main fabric is made of polyester, with fiber heating wire for heating materials, direct hand washing, shaking dry in the shade to dry, and can not be exposed to the sun or baked A USB cable connects to the hat and scarf at the same time and must be connected to the power supply in order to heat, unplugging is not hot Specifications: Voltage: 5V Temperature: 40-50℃ Note: Please unplug the power supply when personnel leave or are not in use to avoid prolonged heating resulting in high temperatures causing accidents The rated power of the product is 5V 0.76A, please do not use higher than 5V mobile power, power adapter, 3.0 or more computers, or USB, USB-C interface. (Use output voltage of more than 5V 3A, the heating temperature will be too high, and easy to cause burns)