Feature: 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 Material: ABS Size: Approx. 10.5 x 18cm/4.1 x 7.1in Bottom Thickness: Approx.4.6cm/1.8in Top Thickness: Approx. 6.5cm/2.6in Maximum Air Volume: 13FCM Maximum Wind Pressure: 12 mmH20 Power: 4.5W Suitable for Cylinder Wall Thickness: ≤15mm/0.6in Suitable for Fish Tank: 30-60cm/11.8-23.6in Voltage: 100-240V Application: Fish Tank Cooling Fan, Cooling Fan. Package List: 1 x Aquarium Cooling Fan1 x Power Adapter Note: Please allow some errors due to manual measurement.