USB rechargeable water-cooling circulation vest. - Brand: apexwin - Model Name: Water-cooling Circulation Vest - Color: Black - Features: USB rechargeable, instant cooling function, easy operation - Size: F size - Included: Cooling packs x 2 Used once, but I'm selling it because I no longer have the opportunity to use it. There are no noticeable scratches or stains, but it has been stored at home by a private individual. Please understand that this is a used item before purchasing.