Features:

• Destroys viruses, bacteria and protozoa--including Giardia and Cryptosporidium--using ultraviolet (UV) light
• Takes 48 seconds to purify 16 ounces of fluid, 90 seconds for 32 ounces
• Easy to use--just press a button to start and the SteriPEN shuts off when purification is complete
• No pumping, no chemicals, no test strips, no timekeeping, no lubricating, and no replacement filters required
• Powered by 4 AA batteries; weighs 8 ounces and measures 7.6 inches long

Editor Reviews:

Product Description:
Don't risk getting sick! Field-tested SteriPEN Handheld Water Purifier makes drinking water safe, pure. Lightning fast! In about 48 seconds it purifies 16 fl. ozs. at the touch of a button. Compact SteriPEN creates powerful ultraviolet light that destroys the DNA of microbes in seconds, so they can't reproduce and make you sick. Uses the same smart technology used by U.S. spring water boiling plants and state municipal plants to purify water. A powerful, germicidal UV lamp comes on automatically when immersed in a glass of water. Adjustable to fit domestic and international water bottles (a smart precaution). More: Destroys cryptosporidium, giardia lamblia salmonella, E-coli, dysentery, cholera, hepatitis, influenza, plus dozens more waterborne bacteria, viruses and protozoa; Depending on battery life, output can yield 30-180 liters (8 3/4-147 1/2 gal.) of pure water; UV lamp lasts approx. 5,000 applications; Uses 4 AA batteries (not included); 7" long, and 7 ozs., easily fits pocket, pack or purse. TIP: always drink upstream from the herd. And trust SteriPEN for pure water when hiking, military field maneuvers and international travel. Order up for H2O protection! SteriPEN Water Purifier

Product Description:
Great for travel or an emergency-preparedness kit, this handheld water purifier destroys viruses, bacteria, and common protozoa. It weighs just 8 ounces with four AA, disposable batteries (not included) and purifies 16 ounces of water in 48 seconds, or 32 ounces in 90 seconds. The purifier employs ultraviolet light (UV) to destroy the DNA of microorganisms, making them unable to reproduce and cause illness. It's effective against outdoor microbes like giardia and cryptosporidium; pathogens that cause diarrhea, dysentery, hepatitis, and Legionnaire's Disease; household germs such as bird flu, E. coli, and salmonella; staph and strep; and natural-disaster risks like botulism, cholera, smallpox, and typhoid.

No pumping, no chemicals, no test strips, no timekeeping, no lubricating, and no replacement filters are required. All that is required is to push the water purifier's button (once for 32 ounces, twice for 16 ounces), place the pen-like lamp in clear water, and stir until an indicator light turns green. Water has no aftertaste after being purified. Measuring 7.6 inches long, the purifier comes with a nylon case and a user's guide. It exceeds U.S. Environmental Protection Agency guidelines for testing microbiological water purifiers.

Product Description:
Great for travel or an emergency-preparedness kit, this handheld water purifier destroys viruses, bacteria, and common protozoa. It weighs just 8 ounces with four AA, disposable batteries (not included) and purifies 16 ounces of water in 48 seconds, or 32 ounces in 90 seconds. The purifier employs ultraviolet light (UV) to destroy the DNA of microorganisms, making them unable to reproduce and cause illness. It's effective against outdoor microbes like giardia and cryptosporidium; pathogens that cause diarrhea, dysentery, hepatitis, and Legionnaire's Disease; household germs such as bird flu, E. coli, and salmonella; staph and strep; and natural-disaster risks like botulism, cholera, smallpox, and typhoid.

No pumping, no chemicals, no test strips, no timekeeping, no lubricating, and no replacement filters are required. All that is required is to push the water purifier's button (once for 32 ounces, twice for 16 ounces), place the pen-like lamp in clear water, and stir until an indicator light turns green. Water has no aftertaste after being purified. Measuring 7.6 inches long, the purifier comes with a nylon case and a user's guide. It exceeds U.S. Environmental Protection Agency guidelines for testing microbiological water purifiers.

Rating : - SteriPEN Purification System
The product did perform as describe. I order two sets of the Lithium Ion battery from another source, one set worked and the other did not.
After a week of constant use, about 6 times a day, it needed a new set of battery. Rechargeable NiMH battery also worked in the unit.

I purchased the combination set with the bottle and pre-filter. The main advantage is the fileter adapter allows the SteriPEN to be inserted into the bottle and form a water tight connection. This makes it easier to shake or swire the bottle without worrying about spilled water.

It took me a while to figure out what was the sediment filter. I thought at first it was missing, but it was the funny thing sticking out the middle of the adapter. Removing the filter from the adapter allows the SteriPEN to be tightly inserted into the bottle. For most purposes, the filter serves no useful purpose, so I just put it away for safe keeping.

I used the unit to purified all my drinking water in Inner Mongolia and any water used to brush my teeth in any hotels in China. At the Beijing Airport, when leaving the country, it did raise some concern about what the device was, and added an extra step to the out processing when they attached a photo of me with a x-ray picture of the unit.

I will take the unit on my next back packing trip to truely purify my drinking water. I have never been sick from just using a water filter on previous trip, but this unit is convenient.

I am very satisfy with this product.