Water cooling vest that circulates cold water to cool the body. - Product Name: WATER COOLING VEST - Set Contents: Vest, battery, connecting hose - How to Use: Circulate cold water through the tubes - Safety: Safe design - Cooling Method: Water cooling Thank you for viewing. I am listing this at the request of my husband, so I don't know much about the functions, but I hope someone in a hot region will find it useful. There is a slight crease in the box.