Two-speed Wind Mode: The small fish tank cool air fan has two air speed modes, you can adjust two gears of air speed, slow and fast. You can adjust the gears according to the actual temperature to achieve the best results. Aquarium Cooling Fan: When the fan is operating, it can deliver cool breeze on the water surface in the fish tank at all times, providing a cool water environment for the fish. Silent Fish Tank Cooling Fan: When the fish tank cooling fan is running, the sound of the fan is very small and almost inaudible. It will not affect the normal activities of the fish. Mini Size Fish Tank Fan: Our cooling fan is mini size, it won’t take much space, the length, width and height is about 10.5 x 6.5 x 2cm / 4.1 x 2.5 x 0.78 inch, suitable for small fish tank with diameter less than 45cm / 17.7 inch. Easy Installation: The fan is easy to install, with a detachable air outlet design and cotton between the bottom of the fan and the pad, which can protect the tank from scratching and also achieve a stable fixing effect.