Comfort ProperFit Soft Silicone Cushion Provides a secure seal and comfortable fit for more efficient pumping. Phase Technology Stimulation and Expression modes. Stimulation mode gently stimulates the breast to initiate milk flow and Expression mode to maximize milk flow. Adjustable Suction Pressure – 6 adjustable levels of suction pressure. Portable and compact – For easy pumping anytime, anywhere. Fewer parts, which makes it easy to assemble, use and clean. Hygienic design to prevent milk from flowing back to the funnel. Bottle stand Secures bottle to prevent spills.