Hydro-Photon manufactures handheld water purifiers that use ultra-violet light to eliminate viruses, bacteria and protozoa from water. No other handheld water treatment system can match our combination of speed, lightweight, ease of use and effectiveness. SterirPEN purifies 1/2 liter of water in 48 seconds and 1 liter in 90 seconds. Our products weigh from 4 - 8 ounces according to type of batteries. Its fast, light, easy and effective - just push the button, put the SteriPEN in water and stir gently until the ultraviolet light turns off. Independent test results are published on our website (xx). SteriPEN markets include travel, hiking and camping, disaster preparedness, emergency/first responder and military. Interested distributors in these markets are encouraged to complete our international distributor inquiry form on our website.