AsobuA,A® UV light hydro bottle. We stay healthy & stay safe. You simply press the button on the lid and the UV light will purify your water in less than 5 mins. Interior remains free from contamination. UV light and battery are incorporated in the lid, and USB battery can have a charged life up to two weeks. Stainless steel, double walled, vacuum insulated bottle that you can fill and drink purified water any-where. Great for camping, travel and outdoor use. Hot up to 12hrs. and cold up to 24 hrs. * Ultraviolet (UV) light is a short wave-length light invisible to the human eye. UV light sanitizer works by penetrating the thin wall of small microscopic organisms destroying it's nucleic acids - disrupting the DNA's structure, killing the organism or making it unable to reproduce.