Promoting underwater supplemental oxygen,It fits for most aquariums,fish tanks,pools and other similar occasions. This product is totally waterproof so that it can be completely submersed in the water. Made of high-grade material, which is non-toxic, safe, energy-saving and eco-friendly. Creates a decorative array of bubbles and colorful column of air in your aquarium,well-distributed, with evenly bubble outle, can be used to light for fish and also be used as a decoration for your aquarium. The light effects are so bright and you can view the fishes at the tank clearly and give you a totally different vision.