The Traveler is half the size of the SteriPEN Classic with the same great attributes: convenience, ease of use and speed. It_s perfect for people traveling to at risk water countries, and for peace of mind in water emergencies anywhere. Traveler is proven effective against risks like Cryptosporidium and Giardia. Now you can carry hundreds of gallons of purified water in your pocket, purse or travel bag. Traveler ships with 2 non-rechargeable (disposable) batteries, a nylon case and user_s guide.