HYBRID & RO FILTER - This outdoor water filter uses a hybrid filter element and RO filter element, which can purify 99.99% of impurities, so that you can drink clean and virus-free water when camping outdoors. TESTED AND CERTIFIED - Passed the certification of various authoritative organizations and obtained certificates, such as FCC FDA CE EMC PSE Rosh, etc., safe and reliable, you can worry-free. BUILT-IN 12000mah iFePO4 BATTERY - The built-in battery can work 27 liters of pure water once charged, which can meet the needs of 13 adults for a whole day of outdoor activities. CUSTOMER SERVICE & LIFETIME WARRANTY - You're not just a customer. You're a friend and we're dedicated to helping you succeed. Our promise: to ensure you’re 100% happy with your ITEHIL purchase. If there’s anything you need, our friendly customer support is here to help. ITEHIL water filter