The Hydor H2shOw Bubble maker releases a continuous stream of life-sustaining oxygen bubbles into your aquarium. It provides much-needed aeration and water movement, while creating a visually exciting display. The Bubble Marker is easy to position and operates at a very energy-effiecient 4 watts! Its easy-to-use and low maintenance design is coupled with high quality and safe construction. The bubble maker produces less vibration and noise when compared to external membrane aquarium air pumps. Its compact size allows it to be placed in all tanks including nano aquariums. Ideal for both freshwater and saltwater applications.