The Symphony is Medela's latest innovation in hospital-grade electric double pumps. This pump has the added advantage of mimicking the sucking pattern of the baby. The pump action begins with a fast, light pattern to enhance let-down, and then switches to a slower and stronger expression phase. The mother can easily change from single pumping to double. We recommend this pump to Mothers who are looking for a lightweight and compact alternative to the Classic Breastpump. Use of this pump requires Medela's Symphony pumping kit. Sold separately.