Product Details: Winter supplies: Suitable for mountain climbing and outdoor activities in cold climates to prevent neck frostbite in cold climates. Comfortable fabric: high quality, delicate touch, warm and breathable. Four levels of vibration massage and three levels of intelligent temperature control. Not afraid of water washing: The water-resistant and water-tight heating system of the product can be immersed in water as a whole, and the power interface is almost insulated and waterproof. USB interface design: 5V mobile power supply can be used, the output voltage is only 5V, safe and reliable. The entire neck is heated over a large area and evenly heated. Specification: Name: USB electric heating scarf Output voltage: USB/5V Human body safety voltage 36V Size: 86 cm * 10 cm Material: Weight: about 300 grams Color: dark gray, dark blue, white, pink, red (optional Packing list: 1*USB electric scarf (without power supply)