From the backcountry to backwater villages around the globe, the Hydro-Photon SteriPEN JourneyLCD Handheld Water Purifier destroys waterborne microbes. Carry the SteriPEN with you and safely drink from a Chinese tap or a stagnant pond. This purifiers UV light kills viruses, bacteria, and protozoaincluding Giardia and Cryptosporidium. The lightweight JourneyLCD has a screen display that tells you dose selection half or one liter, battery status, and countdown timer. Compared to messing with water filtration systems, tasting iodine, or boiling, using the SteriPEN is a cinch. The Journey works with Hydro-Photons pre-filter not included, which removes particulates, and it ships with two CR123 batteries, which will purify roughly 100 16-ounce bottles of water.