A compact single electric pump that packs the efficiency, comfort, and power of the Medela double pumps. Can also be used with batteries. Swiss designed, the Swing is the most silent amongst all the electric pumps and therefore can be used discreetly. Parts that come into contact with breastmilk are BPA-Free. Operates using Medela's patented 2-Phase Expression Technology - it takes just a minute to check... 120 cycles in a minute (true stimulation) and 60 cycles in a minute (true expression)! Time it to compare. The 2phase expression technology delivers more milk in less time.