Made by Sanko Co., Ltd. This is a listing for a USB Hot and Cool. It's a product that uses USB to cool or warm a 250ml can. It's a niche product from an era when various products using USB power were emerging. I purchased this item directly from the manufacturer at the time, but it has been sitting unused in a drawer, unopened. To confirm its functionality, I opened it and tested its heating and cooling capabilities. The product operates using a Peltier element, a component that heats or cools by passing current in either a forward or reverse direction. (The direction is determined by a switch.) Due to the nature of the product, rapid temperature changes are not possible, so please be aware of this. Also, please note that the lid of the included cup has cracked due to aging.