High Compatibility: This drinking water pump is suitable for pure bottled drinking water, compatible with most of 3L-18.9L bottles, To make the pump better hold the neck you should not pry the lid of the water bottle.The water bottle dispenser is suitable for gallon barrels with a 2.16-inch (5.5 cm) neck. Please confirm the size of your neck before purchasing Easy Installation to Carry: Portable water bottle pump size 5.5*2.7inch, its compact size makes it easy to carry. Installation is simple, you just need to put it on the top and it gets ready to go. Ideal for kitchen, office, school or barbecue,during travelling and camping etc, this is a fantastic alternative to bulky, large 5 gallon water dispenser USB Rechargeable: Water Jug Pump with 1200 mAh high-capacity Rechargeable Battery Inside,that is quite a much for a device like this. be used for 30-50 days or around 4-6 bottles of 5 gallon water once fully charged, for a small family it just needs to be charged once a month Unique Design: Compared with other ordinary water pumps, our water pumps are equipped with safety locks.Ong press for 3 seconds and start the smart lock, long press for 3 seconds again to unlock. One switch operation, press the button 2 times, will be automatic cally stop when the water volume reaches 600ml Safe Material: Food grade silicone hose, 304 Stainless steel tap, high density ABS plastic shell which has no smell.The built-in silicone seal prevents water from leaking