FEATURES: Dual usage: works as a stand-alone power head or an internal filter. 3-in-1 power filter performs three functions at the same time: water filtration, water circulation and aeration. Changing and pumping water for your aquarium tank to create a healthy environment for your fish. Strainer to block debris from entering pump. Suction cup mounting feet for either vertical or horizontal mounting Great for both freshwater and saltwater tanks.