The SteriPen Adventurer Water Purifier is a compact handheld purifier that is designed for outdoor or expedition travel. It is reusable for up to 8,000 liters and destroys more than 99.9% of harmful microorganisms ( including Giardia, bacteria, viruses and protozoa). The SteriPen Adventurer is safe and effective without changing the taste, pH or other properties of the water. The water sensor can also be used as a LED flashlight. The product contains two disposable CR123 batteries and a neoprene case with belt loop. Don’t ruin your trip by drinking contaminated water. Stay safe and healthy with the SteriPen Adventurer UV Water Purifier. Check out more details on Amazon here.