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.