SteriPen Traveler mini Handheld UV Water Purifier Compact handheld UV water purifier designed specifically for travelers Destroys more than 99.9 percent of harmful microorganisms, including Giardia Safe and effective without altering taste, pH, or other properties of water Purifies a half-liter of water in 48 seconds; requires two CR123 batteries Measures 1.5 x 6.1 x 1 inch (W x H x D); weighs 3.6 ounces