Features: 1.45 Air Outlet: The air outlet of fish tank chillers fan is designed with a 45 angle, which can cool the water surface faster, and the water surface can be cooled quickly. 2.Small and Easy to Install: The aquarium cold wind chiller features an exterior wall mounted design, which is beautiful, small, and easy to install without taking up space in aquariums. 3.USB Connector Design: This aquarium cooling fan uses a USB connector, which is more secure, and has a switch at the bottom to adjust the fan speed. 4.With Timer: The timer can be more convenient to control the use time of the fan, four groups of mode cycles, only need to set once, and automatically cycle every day. 5.Compatible Socket: There is a compatible socket at the bottom of the timer, which is convenient for switching plugs. The timer is resistant to high temperature and does not deform, and is environmentally friendly and safe. Specification: Item Type: Aquarium Cooling Fan_x000D_ Material: ABS_x000D_ Size: Approx. 10.5 x 18cm/4.1 x 7.1in_x000D_ Bottom Thickness: Approx.4.6cm/1.8in_x000D_ Top Thickness: Approx. 6.5cm/2.6in_x000D_ Maximum Air Volume: 13FCM_x000D_ Maximum Wind Pressure: 12 mmH20_x000D_ Power: 4.5W_x000D_ Suitable for Cylinder Wall Thickness: 15mm/0.6in_x000D_ Suitable for Fish Tank: 30-60cm/11.8-23.6in_x000D_ Voltage: 100-240V_x000D_ Application: Fish Tank Cooling Fan, Cooling Fan PackageList: 1 xAquarium Cooling Fan 1 x Power Adapter Note Please allow some errors due to manual measurement.