（1）Massage mode is used at the beginning of breastfeeding, and fast and gentle stimulation can stimulate the milk flow.
（2）Epression mode, you can switch to it when you have a milk burst, and the deep frequency can better discharge milk.
（3）Symphony mode, with a combination of deep, shallow, fast, and slow frequencies, can better mimic a baby's sucking and help to empty breasts more comfortably and quickly
