2 Phase Technology - Stimulation And Expression: The Chicco Naturalfeeling Manual Breast Pump Is Designed To Follow The Baby'S Natural Sucking Pattern. It Works In Two Phases. Phase 1 Is Stimulation. It Gently Massages The Breasts To Open Milk Ducts. Phase 2 Is Expression. It Leads To The Extraction Of Milk Gently And Effectively, Ensuring A Natural And Constant Flow. ● Maximum Comfort: Thanks To The Ergonomic Handle With Soft Covering, The Chicco Naturalfeeling Manual Breast Pump Ensures Simple Use, Easy Grip, And Less Fatigue.