The Liquid Transfer Pump is battery operated and uses only 2 AA batteries (not included). Easy to use automatic liquid supply with PCB circuit control sensor that will auto stop before overflowing. This full automatic sensing pump is high powered and is portable and light weight. You can pump 9 quarts of liquid per minute. Just switch on to start transferring liquid from one receptacle to another. You can easily empty containers with the Liquid Transfer Pump. It is useful in the garage, basement, bathroom, shop and yard. TeraPump pumps any non-corrosive liquid, such as gas, water(not for drinking water), and oil.