USB battery: built-in 1200 mAh battery. After fully charged, it can be used for 30-40 days or approximately 8-10 bars of 5 liters of water. You don't need to charge it every day Safety and environmental protection: The electric pump is made of food grade silicone, 304 stainless steel, premium ABS plastic, no toxic and tasteless. Our 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 the bottles and tighten it. Intelligent one-click operation, low noise, no drilling, easy operation for children and the elderly Wide compatibility: for pure drinking water in bottles, suitable for different models of barrels of Gallone without the need to open the lid. For example: 4.5L, 5L, 7.5L, 10L, 11.3L, 15L, 18.9L. Removable tube, easy to clean Waterproof design: fully in Built-in diameter silicone, easy to lock. Suitable for home or office, but the compact size makes it easy to carry, you can also use it outdoors, picnic, barbecue, beach vacation