Product Details:Winter supplies: suitable for mountaineering and outdoor activities in severe cold climates to neck frostbite in cold climates. COMFORTABLE FABRIC: High quality, delicate touch, warm and breathable. Four-speed vibration massage and three-speed intelligent temperature control.Not afraid of washing: the water-proof and water-tight products of the washable heating system can be immersed in water as a whole, and the power interface is practically insulated and waterproof. USB interface design: 5V mobile power supply can be used, and the output voltage is only 5V, which is safe and reliable. The entire neck is heated in a large area and heated evenly.Specifications:Name: USB electric heating scarfOutput voltage: USB/5V human body safety voltage 36VSize: 80cm*10cm/31.49*3.93 inchesMaterial: Weight: about 300g Color: Dark Gray, Light Brown, Dark Blue, White, Pink, Purple, Red (OptionalPacking List:1*USB Electric Scarf (without power supply)