Ultra Quiet: Made of ABS thickening engineering plastics, super silent aquarium air pump. Soft rubber foot pads, further palliation for noise. Compact but Powerful: Mini size 3.5x2x1.6 in / 9x5x4 cm, 2Watt aquarium aerator pump, output 1.5 L/min, great for up to 15-gallon small size fish tank.