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 day Safety 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 products Easy 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 the elderly High 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 carry, you can also use it when outdoor travel, picnic, barbecue, beach holidays