The Marine Metal Hush Bubbles won"t scare the fish away that you"re trying to catch. Instead this quiet machine will detoxify your bait"s water and keep the bait fresh and vital so you can make a big catch. Operates on 2 D-cell (not included) up to 52 hours. Water resistant case with neoprene seals and a booted waterproof switch. Beryllium copper battery contacts for longer battery life. Weighted air stone with 24" of silicone air line tubing enclosed in pump. Large adjustable stainless steel clip for attaching to any bucket. Dry Box design is designed to keep the pump dry while in use. Use can use this in fresh water or saltwater fishing applications so you can go anywhere with live bait.Individually tank tested. Space saver clam shell package 3 7/8" x 7 1/2" x 2".