The Sanitizer Ultra Violet Water Bottle purifies water in 5 minutes or less. It destroys bacteria and viruses with Ultraviolet (UV-C) Light. Press the top button once for 3 minutes of UV light or twice for 5 minutes of UV light and you're done. Perfect for being sure your water is germ free. A safety feature keeps the UV light from activating if it is not on the bottle. The built in battery will last up to 2 weeks with average use. Included is a USB charging cord. Great for camping, airport fill-ups, and anywhere you fill the bottle with water. 17 oz