Steripen ultra-violet lamp destroys over 99.9% of Bacteria, viruses and protozoa. Ultralight UV purifier quickly purifies 1.0L of water in only 90 secs. Easy to use, one-button operation provides 8,000 treatments producing up to 8,000 L of purified water. Water activated sensors turn on after lamp is in water. Compact, lightweight at only 2.6 oz. Ultralight UV purifier can be recharged using its USB port.