Marine Metal Products B-16 Hush Bubbles air pump is a very quiet aeration pump for fishing or home aquarium use. Operates on 1 or 2 alkaline D cell batteries for up to 75 hours. The Clam Shell package s unique design doubles as a dry box and protects the pump from moisture intrusion. Unit includes 30 of soft silicone airline tubing and a weighted air-stone. The B-16 Hush Bubbles aerator has a rubber booted on/off switch and a neoprene gasket to help protect the unit from moisture intrusion. Hush Bubbles can be used for fresh or saltwater fishing or fish transportation. Ideal as a battery operated back up for your home aquarium (up to 10 gallons) with a long running time of up to 75 hours. Hush Bubbles size is 7.65 x 3.95 x 2.1 and weights .07lbs.