Wearable Technology ValueRays Heated Scarf Neck Warmer Heated Scarves Warming Shawl Electric Heated Wrap USB Infrared Heat. Stay warm while sitting at the computer or in cold weather. This USB heated neck warmer by ValueRays uses a 5v carbon fiber heating element to create warm, deep soothing, infrared heat. There are 3 temperature settings ranging from 104-122 degrees Fahrenheit. It is USB powered by a power bank or computer. There's a pocket to hold a power bank. Inside the pocket is a USB connector. If you are sitting at the computer, use a USB extension cord to plug the scarf into the computer to draw power to produce heat. If using a power bank, the USB connector connects directly to the power bank. The power bank is placed inside the pocket for easy mobility. The fabric is washable and fold-able for travel or storage. It is constructed of a nylon fabric, soft polyester shear-ling fabric and cotton. It is comfortable and soft to the touch or next to the body. The USB Heated Scarf Neck Warmer by ValueRays measures about 6 inches wide and 31.5 inches long. Perfect accessory for people who work in a cold environment or need to keep warm inside or outside. Perfect heated accessory to wear for outdoor sporting events.