Compact and versatile units are ready to install - no additional tubing or circulation pump requiredBuilt in UV-C lamp ballast and single power cord mean streamline and clutter-free installation and operation.You are purchasing a aquarium internal filter, with built in UV steriliser.The addition of a UV steriliser to your aquarium can assist with water clarity by killing off algae, micro-organisms, bacteria and parasites which may cause fish diseases.Size: about 25*5.5*6.5cm ; Pump power: 5W; Great for both fresh and salt water aquarium.Install in vertical or horizontal position right in your aquarium or sump.- Install in vertical or horizontal position right in your aquarium or sump.- Great for both fresh and salt water aquarium.Specification:Size: about 25*5.5*6.5cmCable length: about 1.45mUV power: 5WPump power: 5WVoltage: 220-240VFrequency: 50HzH-max: about 0.4mOutput: 500L/HPackage:1*oxygen pump (US Plug )