This is the SteriPEN® Freedom, a portable yet effective water sterilizer. Simply immerse the Freedom's lamp into 1/2 litre (16 oz.) of water for 48 seconds (automatically pre-timed) and the watrer is ready to turn into coffee or used to boil Kraft Dinner. Have 1 litre of water? Simply run the treatment twice in the same container. It's cordless and a single charge will last you about 40 "treatments". It's available for about $120 from REI, MEC or their online store.