Plan on taking a rugged camping trip soon or venturing to far away lands on vacation? Then you should take SteriPEN along. Simply insert the SteriPEN into 16 ounces of water, turn it on and wait 48 seconds. You now have pure, clean & safe drinking water. The ultra-portable SteriPEN uses UV Light to purify the water and destroy microbes, germs and viruses at a 99.99% success rate. There are so many great uses for this thing: vacations, emergencies, hiking or you just don’t trust the water supply.