This NCVI electric breast pump uses multi-mode adjustable suction and an anti-backflow hygienic design, with replaceable multi-size flanges to fit most nipple sizes. It delivers a comfortable and efficient pumping experience for office moms and breastfeeding mothers at home. Core Features: 4 Pump Modes with 9 Adjustable Suction Levels. Massage Mode: gentle rhythmic vibration stimulates the mammary glands to trigger let-down and relieve breast swelling before pumping. Multitronic Suction Mode: variable frequency wave suction simulating a baby's natural alternating sucking rhythm. Suck Simulate Mode: imitates a stable baby nursing frequency for continuous, smooth milk output. Express Mode: steady moderate suction to fully empty the breast efficiently. Every mode supports 9 customizable suction intensities, letting moms adjust comfort freely. 4 Replaceable Flange Sizes for a Custom Fit: four detachable soft silicone flanges to match different nipple diameters, avoiding nipple pain from an improper size: 21mm fits nipple base 17–19mm; 24mm fits nipple base 20–22mm; 28mm fits nipple base 23–26mm; 32mm fits nipple base 28–30mm. Proper matching reduces friction and pain.

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