The Aquatop AC/DC-One Battery Operated Air Pump serves as a dependable backup air supply when your primary air system stops working. Ideal for emergencies like household power outages, it also functions as a convenient portable aerator for transporting fish. This pump includes an air stone, 23-inch tubing, and an AC power failure sensor for added reliability. It operates on two D cell batteries (not included). Available at shop.morphmarket.com.