USB battery: built in 1200 mAh battery. After fully charged, it can be used for 30 40 days or about 8 10 barrels of 5 litres of water. You do not need to be charged every daySafety and environmental protection: The electric pump is made of food grade silicone hose, 304 stainless steel, high-quality ABS plastic, non-toxic and tasteless. Our drinking fountains are designed for your family and even babies and are absolutely safe productsEasy to install: simply insert the hose into the water in bottles and tight. One click intelligent operation, low noise, no drilling, easy to use for children and older peopleHigh compatibility: for pure drinking water in bottles, suitable for various gallon barrel models without the need to open the lid. For example: 4.5L, 5L, 7.5L, 10L, 11.3L, 15L, 18.9L. Removable tube design, easy to clean Waterproof design: built-in full diameter silicone, easy to lock water. Suitable for home or office, but the compact size makes it easy to transport.