Extremely quiet aeration system. Operates on 2 D cell batteries for up to 52 hours; 12 vdc adapter (included); and has a 110V adapter port (not included). Powerful 3 vdc motor pumps up to 1.39 Liters of air per minute. Aerates 5-10 gallons; water resistant case with neoprene seals and a booted waterproof switch; 30 of soft silicone airline tubing with weighted glass beaded air stone. Adjustable stainless steel mounting clip and fasteners; for fresh and saltwater; space saver clam shell package; 5-1/2 x 7-1/2 x 2.