The SteriPEN is a light weight easy to use, water purification system. While it is not as easy to use like the iStraw, the SteriPEN uses ultraviolet light (UV-C) to kill bacteria. The device simply requires you to insert it into a bottle of water and press the ‘ON’ button while gently stirring. No need to pump or add chemicals. The SteriPEN is compatible with both cold and warm water. It also adds no after taste to the water.
The SteriPEN can purify a 16 fl. oz. bottle of water in less than a minute. It can clean a 32 fl. oz. bottle in a minute and a half. Powered by 4 AA batteries, the device can purify 20 to 40 16 fl. oz. bottles; 400 bottles with the optional lithium AA batteries. The low battery indicator informs you when batteries are running low on power. The SteriPEN is good for up to 5,000 uses.
Depending on which model you buy, the SteriPEN costs between $74.27 to $124.47 via Amazon. The $124.47 version includes a solar panel case. The $74.27 version is the original, slightly heavier model with a pre-filter, which is used to clean the water from debris and sediment. Finally, the $93.35 version is similar to the most expensive model minus the solar panel.
Via: Spy Review