SOBO WP-303H Aquarium Filter Pump Hanging Filter [ AC-220-240V 50/60Hz Power : 5W F.MAX :280L/HR ]… FEATURES: 1- Water pump and filtering media all built in structure. 2-Combination of mechanical,chemical,and biological filtering function to eliminate toxins effectually and ensure clean water 3-Special designed water circulating system helps the diffusion of CO2 in the water and supply enough of oxygen for the tank. 4-Adjustable water flow rate . Easy to assemble and operate .