Quiet Bubbles Water Resistant Air PumpExceptionally quiet pump has neoprene seals and waterproof switch. Runs 36 hours on two alkaline D batteries. Adjustable stainless steel mounting clip. Aerates up to a 7 1/2 gallon tank. Type: Diaphragm Capacity: 0.877 liters/minute Aerates up to 7 1/2 gallon tank Inlets/Outlets: Weighted airstone Mount: Adjustable stainless clip and fasteners Warranty: One year