High compatibility: The drinking water pump is suitable for gallon barrels with a 5.5cm neck. It is equipped with two adapters and is compatible with water bottles of different capacities: 2-5Gallon, or 4.5L, 5L, 7.5L, 10L, 11.3L, 15L, 18.9 L. No worries Safe Material: BPA-free water dispenser, food grade silicone hose, 304 stainless steel, high density ABS plastic, non-toxic and tasteless. USB Rechargeable: Built-in 1200mAh rechargeable battery. A full charge can be used for 30-40 days or about 4-6 bottles of water. One-touch operation: just stick the water bottle pump on the bottle neck and press the button to start pumping (note: press the switch once, pumping automatically stops for 30 seconds, press the switch for 3 seconds to work continuously for 30 minutes Automatic switch, convenient and quick, it is completely worry-free and can be used by children and the elderly. Lightweight and portable: This pump is lightweight and portable, so you can use it as you like. Use this machine in your home, kitchen, office. You can even use it when having a picnic or camping. Compared to a pump with manual water, it is very easy to use