Thank you for viewing. Please read the profile and product description. This is an XL size Peltier vest. Used only once for about 3 hours. Both cooling and heating functions work without any problems. There are scratches on the Peltier terminals. - Model: PV111 - Size: XL - Number of Peltier units: 4 - Brand: HOOH - Input terminal: USB Type-C Although it has been used very little, it is a used item, so please refrain from purchasing if you are sensitive to such things. Price negotiations are accepted, but requests for price reductions without any message will not be entertained.