With the SteriPEN Classic 3, you no longer have to rely on your luck when you're out and about - you can be sure of clean drinking water. The UV light destroys over 99.9 percent of pathogenic microorganisms in the water. Depending on which batteries you use, you can treat up to 150 liters of water (with lithium batteries). The LED display tells you when the treatment is complete and the service life of the batteries and UV lamp. Cleaning water is very easy with the SteriPen Classic 3: remove the lamp cover, press the activation button, immerse in water and stir. 90 seconds later, you have a liter of clean drinking water without any unpleasant-tasting chemicals.