Works for 6000 hours before needs servicing. Features & Benefits 2-Phase Expression® technology: Designed to mimic a baby's natural nursing rhythm. Convenient: Single or double pumping. Two separate, independent membrane units: Allows switching between single and double pumping by simply applying or removing the second collection kit to the breast. Let-down button: Moms can easily return to stimulation by pressing the let-down button. Initiate and maintain milk supply: If direct breastfeeding is not possible, as well as collect breast milk at work or during other absences from the baby. Hospital grade (multi-user):