One-button easy operation: one-button operation, press one button to pump water, then press one button to stop pumping, press the button twice, it will stop automatically when the water volume reaches 600ml. Convenient and quick, even children and the elderly can use it easily. Easy to Install and Carry: The portable kettle pump measures 5.5*2.7 inches, and its compact size makes it easy to carry. Installation is easy, you just put it on top and it's ready to go. This is a great alternative to bulky, bulky, large 5 gallon water dispensers. High Compatibility: This drinking water pump is suitable for pure bottled drinking water, compatible with most 3L-18.9L bottles, in order for the pump to fix the neck better, please do not pry open the water bottle cap. Water Bottle Dispenser Fits for gallon barrels with a neck diameter of 2.16 inches (5.5 cm). Please confirm your neck size before purchasing. USB Charging: The kettle pump has a built-in 1200mAh high-capacity rechargeable battery, which is quite a lot for such a device. It can be used for 30-50 days or about 4-6 bottles of 5-gallon water after being fully charged, and it only needs to be charged once a month for small families.