2-Phase Expression technology:
Thanks to Medela's 2-Phase Expression technology the breast pump simulates your baby’s natural sucking behaviour at the breast and feels very comfortable to use. The 2-Phase Expression starts off with a short, quick sucking rhythm until your milk starts to flow. It then changes to a slow rhythm to express the milk. The simple up/down buttons allow you to control the vacuum strength to suit your comfort level as this is when your milk will flow best.