The aquarium oxygen pump also has a unique feature that allows it to create a mist effect in the water. This creates a beautiful and mesmerizing underwater landscape that is sure to impress any onlooker. The mist effect also helps to oxygenate the water, providing a healthy environment for your fish. Features -Color:Sky-blue -Material:Acrylic -Size:8.50X7.00X6.70cm/3.34X2.75X2.63in -Creates a mesmerizing mist effect in the water, enhancing the visual appeal of your fish tank. -The oxygenating head ensures a healthy environment for your fish by providing ample oxygen supply. -The nano bubble stone improves the oxygenation process, creating efficient and effective oxygen supply for your fish. -Made from safe and easy-to-clean acrylic material, ensuring use and easy maintenance. -The quiet operation of the air diffuser promotes a peaceful and tranquil atmosphere for your fish tank. Package list: 4 Tank 4 x control valve