The Bubble Box is great for use with buckets, coolers or small tanks. It runs up to 30 hours on two D-cell alkaline batteries (not included). Aerates up to 7-1/2 gallons and has adjustable stainless steel mounting clip, air stone and overlap case construction for quietness and durability. Works with freshwater or saltwater. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Aerators.