Extremely quiet aeration pump. Operates on 2 "D" cell batteries for up to 52 hours. Powerful 3 VDC motor pumps 1.1 liters of air per minute; aerates 5-7 gallons. Water resistant case with neoprene seals and a booted waterproof switch; soft silicone airline tubing with weighted air stone; adjusted stainless steel mounting clip with fasteners. For fresh and saltwater. Space saver clam shell package 3 7/8" x 7 1/2" x 2". Also converts to protective "splash jacket". Aerates up to 8 gallons Pumps 1.2 STL / minute Space saver clam shell package 4.125"W x 7.625"L 2.125"D