Fine bubbles: Small bubbles are generated on the battery board. Beautiful bubbles will also make oxygen replenish vigorously. It helps increase oxygen, maintain fresh air and create a healthy environment for fish. Silent design: The aerobic bubble oxygen stone is a silent design. With pump as the power, it makes full use of the power of gas lift. It has no power device and no noise when working. Even if you fall asleep, there will be no effect. Adjustable: The bubble stone has a rotatable design. The size and density of the bubbles can be adjusted arbitrarily. Add different effects to your fish tank. Suction cup design: The superior suction cup design is used to fix the air stone to prevent friction and wear and prolong the service life. Suitable for different occasions: The aquarium oxygenated air bubble stone can increase the air flow and circulate it to your aquarium, pond, hydroponics and aquaculture to oxygenate the water body, which is beneficial to aquatic organisms. Product size 5 x 2 x 3 cm; Size 2 sticks Quantity 2 Package includes suction cup*2, base*2, bubble cotton*2, bubble adjustment cover*2