It\'s small gives excellent performance and is simple to fix to the tank with suction cups. The filter sucks the water in through vents carries it through the filter sponge and directs it further up cleaned back into the tank. You can also connect an outlet hose in order to adjust the outflow direction.Unobtrusive slim design. Front water intake. Connection for water outlet hose. Completely equipped with original. EHEIM filter pad ready to use. Only 5 Watt power consumption.For aquariums up to 30L