Amazon Description... [High Precision Filtration Technology] Adopts innovative 5-stage filtration. Ultrafiltration membrane, PP cotton, KDF and activated carbon in the filter element can ensure 0.01 micron ultra-high precision filtration; It can effectively isolation of chlorine, sediment and other large particles, and can improve the taste. Passed FDA standard test, FCC, UL, SGS certification. Power button can be easily pressed to clean water in outdoor environment;In the process of getting water outdoors, freeing your hands,you can pack your bags, set up tents, cook, etc. The emergency light makes it easy to get water outdoors at night. [Fast and Long Endurance] Ultra fast purified water flow of 700ml (23 oz.) per minute. Built in large capacity lithium battery, one charge can purify 168000ml(5681 oz.) of water, enough for 10-to-15-day backpacking and multiple people to use at the same time. It can be powered in multiple ways: mobile power supply, solar panel, vehicle power supply etc. [Light, Small and Portable] Only weighs 350g and is small in size; The multi-functional storage bag can store all the accessories, and can be easily hung on the backpack, belt and trousers etc. [Filter Water Anywhere] Turn rainwater, spring water, lake water and river water into clean drinking water.Ideal for hiking, camping, backpacking and international travelers who need clean drinking water.Add it to your backpack list now and get ready to go! View the BKLES BK-2000 Here at Amazon https://amzn.to/3IZHx3U Replacement Filters at Amazon: https://amzn.to/3kqqgGN