LuvLap Sunshine Electric Breast Pump is designed to mimic a baby’s natural breastfeeding rhythm, making expression a pleasant experience for the mother. The soft silicone massage cushion along with 2 pumping stages of massage & expression help to give a natural-like experience. Expression mode has 5 intensity levels, and the 2 in 1 mode operates automatically on a combination of stimulation and expression. The Boost-up button increases the suction intensity at any level from 10-30%. The AA battery operation option gives you freedom to use the pump anywhere.