By pressing the handle, the pressure in the inner cavity is turned into negative pressure, so as to generate suction. Between pressing and placing, the baby's natural sucking is simulated, and the suction is comfortable and obvious.This product is made of food grade PP material & liquid silica gel. It does not contain bisphenol A and other harmful substances to protect the baby's health.Breaking the traditional non adjustable malpractice, the mother can adjust the strength according to her own needs, easily suck milk, and operate more freely.