The Smart Air is the most innovative quiet air pump in the world. So you can enjoy your aquarium hobby without annoying sounds, because the noise is less than 38 dB. The smart air is easy to install on the side of your aquarium with the integrated suction cup. Due to the design the membrane cannot be replaced (the life span is about 1 year). The smart air is maintenance free and designed for small aquariums up to 50 litres. The smart air 2 has two outlets. The pump is very energy efficient.