Wowhomeshop USB Electronic Power Heating Unisex Lint Neck Scarf (Fever Sheet Size:4*5.5 Inch) (Black) Low power supply: Best warm product in cold winter, especially for rooms without electric warmer or hanging outside. Smooth, comrotable touch feelings: The material is soft and smooth,comfortable feeling. Scarf warms up fast:High thermal efficiency, can protect your neck from cold weather. USB powered, no need battery: Easy to be used, connecting PC USB port or with AC plug power adapter. No drivers required: Easy to set up, no drivers required, simply plug it into any desktop or laptop, PC or Mac