Sobo 333A Air pump.3.5 l/min, long lasting performance. Energy saving design. With low noise and big output. 3watts. Very useful to operate toys/ airstones/ diffusars. Good to break suface of water for oxygen. It is designed to oxygenate your aquarium efficiently and quietly with its low power consumption and advanced air compressing system. Makes your aquarium oxygen levels high and helps keep your fish healthy. It is well built to produce a good volume of air quietly with its low power consumption. Makes your aquarium oxygen levels high and helps keep your fish healthy.