Product Dimensions:8 x 1.5 x 8 cm; 100 Grams Thickness:2 Centimetres Quantity:1 batteries required:No Item Weight:100 g welcome to my store , Hope you have a pleasant shopping trip! Features:1.Strong Practicability: Strengthen the circulation in the tank, cool down quickly, increase the content of Co2, and promote the growth of plants.2.Rapid Cooling: The rotation speed reaches 1800r/m, which can quickly reduce the temperature in the aquarium.3.Low Noise: Fixed with rubber nails to reduce vibration and noise.Specifications:Size: 8cmx8cmx1.5cmService Life: more than 20000hInstallation Aperture: 4mmPackage List:1 X Aquarium Cooling Fan Notes:1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Please allow 1-2cm slight dimension difference due to different manual measurement. Strong Practicability: Strengthen the circulation in the tank, cool down quickly, increase the content of Co2, and promote the growth of plants. Rapid Cooling: The rotation speed reaches 1800r/m, which can quickly reduce the temperature in the aquarium. Low Noise: Fixed with rubber nails to reduce vibration and noise Long use Time: The use time exceeds 20000h. SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied. See more product details Strong Practicability: Strengthen the circulation in the tank, cool down quickly, increase the content of Co2, and promote the growth of plants. Rapid Cooling: The rotation speed reaches 1800r/m, which can quickly reduce the temperature in the aquarium. Low Noise: Fixed with rubber nails to reduce vibration and noise Long use Time: The use time exceeds 20000h. SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied.