This is a Peltier device from Murakami Hifuku. I used it for about a month after purchasing it new. With the cool switch, it goes down to minus 23 degrees Celsius. With the hot switch, it goes up to plus 50 degrees Celsius, so it can be used in both summer and winter. No returns or exchanges. Thank you. Murakami Hifuku HOOH Peltier Peltier vest Hot Cool