SteriPen Classic Bundle Pack with Pre-Filter Water-purification system with SteriPen Classic UV water purifier to eliminate pathogens and a SteriPen Pre-Filter to remove sediment SteriPen Classic's UV lamp provides 8,000 treatments--with up to 200 treatments per battery set; treats 16 ounces of water in 48 seconds 4x4-micron pre-filter screen removes all sediment and stores within the water bottle lid Requires four AA lithium batteries; comes with carrying case Recipient of the Water Quality Association (WQA) Gold Seal, certifying that SteriPen purifies water safely and effectively