SteriPEN purifies water using Ultraviolet (UV) light. Whether your source is a clear running brook or a hotel tap, SteriPEN destroys viruses, bacteria and protozoa including Giardia and Cryptosporidium in seconds. Specifications: Weight:  3.7 oz. without batteries. (6.5 - 8 oz. with batteries, depending on type). Dimensions:   (L) X 1.5 (W) X 1.5.  Battery:  4 disposable or externally rechargeable AA batteries.  Bulb life:  8,000 uses

• - Weight: 3.7 oz. without batteries. (6.5 - 8 oz. with batteries, depending on type)
• - Dimensions: 7.6" (L) X 1.5" (W) X 1.5" (H)
• - Battery: 4 disposable or externally rechargeable AA batteries.
• - Bulb life: 8,000 uses

Demo Video here:  http://www.steripen.com/video/SteriPENdemo.mpg