Get purified water wherever you go. 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.