Wide Range of Applications: From 4.5L to 18.9L , which can help you adapt to more application scenarios and gallon barrels of different depths. Health & Safety: BPA free electric drinking water dispenser, Food grade silicone hose, 304 stainless steel, High density ABS plastic, No toxic and no smellSafe to useSolve the bacteria and other health problems caused by repeated boiling and cooling of traditional water dispensers. USB Rechargeable Battery: This bottle water pump has a built in rechargeable 1200mAh battery that can be used for a long time at full charge without charging every day. 4W strong pump to ensure fast water pumping. Easy to Use: Simply fasten the small pump on the bottle mouth. One switch protection System,Press LED button .