High compatibility: The drinking water pump is suitable for a gallon barrel with a neck of 5.5 cm. Compatible with bottles of different capacities: 2 - 5 gallons, 4.5 liters, 5 liters, 7.5 liters, 10 liters, 11.3 liters, 15 liters, 18.9 liters. Don't worry. Safety materials: water dispenser without bisphenol A, food grade silicon pipe, 304 stainless steel, high density ABS plastic, non-toxic and odorless.% S needs to be recharged daily. USB charging: Built-in 1200 Mah charging battery. Full charge can be used for 30-40 days or about 4-6 water bottles. One-button operation: Just stick the water bottle pump on the bottleneck and press the button to start pumping (Note: press the switch once, pumping will automatically stop for 30 seconds, press the switch for 3 seconds, continuous operation for 30 minutes, the automatic switch, convenient and fast, don't worry at all, can be used by children and the elderly Lightweight and Portable: This pump is lightweight and you can use it as you want. Use this machine in your home, kitchen, office. You can even use it for a picnic or camping. It is very easy to use compared to the manual pump. Note: do not use when charging; Do not use fast charging as this will damage the device.