SteriPen Traveler Handheld Water Purifier Fast SteriPEN Traveler purifies a 16oz. Glass of water in just 48 seconds Light Weighs only 3.6 oz. and uses 2 CR123 batteries, the ones used in many cameras Easy One button operation. No pumping, no chemicals, no test strips Effective SteriPEN Traveler destroys the DNA of microbes like bacteria, viruses Safe Traveler's UV technology has been tested at 3 leading research universities