SteriPEN Freedom Solar Water Purifier Bundle Pack Impact-resistant quartz bulb treats up to 4,000 liters of water Smallest and lightest SteriPEN, only 5.1" long and weighing only 2.6 oz Instant-on, button-less design destroys viruses, bacteria and prot ozoa in just 48 seconds USB-rechargeable internal battery and included portable solar panel for extended range of use Industry-leading safety features