Extremely quiet air pump. 3V DC-Pumps up to 52 hours with 2 alkaline "D" batteries. Fresh or saltwater. 12V to 3V cigarette adapter enclosed. Powerful pumps 1.39 liters of air/min. Weighted air stone and 30" of tubing inside case. Water resistant case and switch. Large adjustable stainless steel mounting clip. Aerates 7½ gallons. Back up aquarium pump.