Ultraviolet (UV-C) light rays safely sterilize clear water by destroying 99.99% of protozoa, bacteria and even viruses * Purifies 16 Ounce of water (cold or warm) in less than a minute; Can be used up to 8,000 times; You"ll get about 40 treatments per charge * Fits perfectly into store-bought bottles of water; just insert the Ultra into the bottle, flip the bottle upside down and start treating the water * Use only on clear water, as cloudy, sediment-laden water hinders effectiveness; Fits All prefilter (sold separately) clears debris from water * Includes SteriPEN Ultra water purifier, USB cable, carrying case and instruction manuals