Feature: 1. Wall Mounted Design: Fish tank chillers fan adopts external wall mount design, beautiful, small size, easy to install, not occupy the fish tank space. 2. Fast Cooling: Aquarium cooler fan's air outlet adopts 45 degree angle design, for the water surface cooling faster, the water surface can be cooled down quickly. 3. USB Connector Design: Aquarium cooler fan adopts USB connector design, which is safer to use, with a switch at the bottom, you can adjust the fan speed according to your needs. 4. Applicable: Aquarium cooler fan is powered by 2.5W, silent cooling fan. Suitable for fish tank under 30cm/11.8in. 5. Premium Material: Wall mounted fish tank cooling fan is made of premium ABS material, strong and durable, wear resistant, long service life. Specification: Item Type: Aquarium Cooler Fan Material: ABS Size: Length: Approx. 13 cm/5.1in Width: Approx. 7 cm/6.7in Thickness: Approx. 2.8/1.1in Top Width: Approx. 5.5cm/2.2in Use: Fish Tank Cooling Fan, Cooling Fan Maximum Air Volume: 4.5FCM Maximum Wind Pressure: 0.35 mmH20 Power: 2.5W Suitable for Tank Wall Thickness: ≤ 9mm/0.35in Suitable for Fish Tank: ≤ 30cm/11.8in. Package List: 1 x Aquarium Cooler Fan Note: Please allow for some errors in manual measurements.