3 [Low Noise] The breast pump noise is 45 decibels, which will not disturb the sleeping baby, and mothers will not feel embarrassed to pump milk in the office or on the go. [Improve Breast Pumping Efficiency] The second-generation motor has a maximum suction value of 350mmHg, with 4 modes and 12 levels, which can naturally imitate the sucking action of the baby.