Katadyn Steripen Classic 3-UV Water Purifier. Winner of Time Magazines Best Invention of 2001 it offers enhanced ergonomics and battery life as well as improved water resistance. An 8000 treatment lamp delivers a lifetime of purification. Specifications for Katadyn Steripen Classic 3 UV Water Purifier: Manufacturer: Katadyn Size: One Size Volume: 0.5 liters Application: Travel Height: 1.7 mm Age Group: Adults Weight: 178 g Battery Type: AA Package Contents: Katadyn Steripen Classic 3 UV Water Purifier Katadyn SP-MP-EF: Steripen Classic 3-UV Water Purifier