Mini vacuum pump, 370 air pump, diaphragm pump, can also be used as an air pump, oxygenation pump, it is a negative pressure pump used in breast pumps. The motor is a 370 motor with precious metal brushes, suitable for a voltage of DC 3V. This pump was originally used in disinfection gu ns for atmospheric volume air pumps, and belongs to the category of ultra high power density violent air pumps. It has a large air volume but a relatively loud sound. While test it, this is a violent air pump with a large volume of air, but relatively loud noise. It can also be used as a vacuum pump, but personally, I feel that its suction is not proportional to the amount of air injected, so it is not very powerful.