SteriPEN Adventurer Opti UV Personal Water Purifier for Camping, Backpacking, Emergency Preparedness and Travel

Compact handheld UV water purifier designed specifically for outdoor/expedition use; Reusable for up to 8,000 liters
Destroys more than 99.9 percent of harmful microorganisms, including Giardia, bacteria, viruses, and protozoa
Safe and effective without altering taste, pH, or other properties of water; chemical-free
UV lamp can be used as an LED flashlight; weighs 3.6 ounces; measures 1.5 by 6.1 by 1 inches
Comes with two disposable CR123 batteries and a neoprene case with belt loop