Water level controller with only one sensor for nano aquariums or small aquariums with up to 200 liters (55�USgal.), placeable into cabinet filter systems or on the edge of the aquarium. Scope of delivery: ready for installation with 11V power supply, low-voltage metering pump, 3m (118�inch) hose, magnet holder for up to 10mm (0.39 inch) glass thickness and a protective cover for the sensor.