What a great find. Stumbled across this one night and bought it. It turned out to be fantastic. Not only is it cordless (running off usb pack) it gets pretty hot and lasts for hours. It has three heat settings, red is high, white is medium and blue is low. If you just turn it on it flashes red, stays on high for 5 minutes and then switches to medium. Which is great throw on in the mornings as a heated scarf. If you change the heat setting to any of the three levels it will hold that setting indefinitely. The twin usb battery bank it comes with is 5000mAh and is light and slim. Overall this was a great find and I can honestly recommend.