The electric breast-pumps with automatic control use the suction-release cycle, without the mother’s intervention. That is why the collecting kit is equipped with an obturating stopper to avoid air leak. The mother adjusts the suction pressure level thanks to a graduated knob on the device according to her comfort. The automatic functioning and the adjusment progressiveness of the suction make these devices often very appreciated by mothers who use a breast-pump for the first time.