Safe Materials: The water pump is a BPA-free water dispenser, food grade silicone hose, 304 stainless steel outlet pipe, high density ABS plastic, non-toxic and odorless USB Rechargeable: Built-in 1200mAh rechargeable lithium battery. A full charge lasts for 30 to 40 days and can make about 4-6 bottles of 5 gallon water. No need to recharge every day High Compatibility: The electric bottled water pump is suitable for dispensing pure bottled drinking water, as well as various models of gallon drums, without lifting the lid. Compatible with different gallon bottles: 2 gallon, 3 gallon, 4 gallon, 5 gallon Purchase Notes: The drinking water pump is suitable for gallon drums with a neck diameter of 2.16 inches (about 8 cm). Please confirm the size of your bottleneck before purchasing Easy to use: Suitable for indoor and outdoor use. It is the best choice for offices, homes, kitchens and schools. Simply attach the pump to the drinking water on the neck of the bottle. One-touch automatic