Oase Oxymax 100 aquarium air pump. 
3.5w
Max flow 100lph
Fully adjustable using variable control valves.
Including 2m airline hose & innovative air diffuser.
Multiple mounting options
3 year guarantee 
The ventilation pump reliably supplies aquarium inhabitants and plants with oxygen. The air pump can also be used for decorative purposes (air bubbles, waterfall effect). The air output volume and bubbling pattern can be individually adjusted. The ventilation pump runs quietly and is very robust. It can be used standing or suspended and is suitable for freshwater and saltwater aquariums.