
HeatWave Scarf works with warming pads built into the cloth. These pads are powered by a 5V USB connection. You can plug the scarf into any USB port or portable power bank and choose how hot you want it to be (low, medium, or high). The warming pads start to make heat right away, making your neck feel better and warmer right away. The heat is spread out evenly across the scarf, so it stays warm while you wear it. Because it's designed to be easy to use, you can take it with you when you travel, commute, or do things outside.