ColorSilver Easy Installation to CarryPortable water bottle pump size 5.5*2.7inch, its compact size makes it easy to carry. Installation is simple, just need to put it in 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. High CompatibilityThis 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 (5.5cm) neck. Please confirm the size of your neck before purchasing. EASY OPERATION WITH ONE BUTTONOne switch operation, press one to pump water, press again to stop pumping water, press the button for 2 times, will be automatically stop when the water volume reaches 600ml.Convenient and fast, even children and elders can use it easily. USB RECHARGEABLEWater Jug Pump with 1200mAh 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 full charged, for a small family it just need to be charged once in a month.