Highly efficient and time-saving The Swing Maxi breast pump is a solution for active mothers who need to pump regularly and to increase milk supply. Swing Maxi has a more powerful motor than the single electric Swing Maxi breast pump allowing a mother to pump 18% more milk in half the time with the combination of simultaneous expression and 2-Phase Expression technology. Comfortable and convenient Swing Maxi offers 9 fully adjustable vacuum levels for a comfortable pumping session. It is lightweight and compact with both - electric and battery power - guaranteeing comfort, freedom and flexibility. Mother friendly operation Swing Maxi can be used for single and double pumping without a loss of performance. You can also switch between phases and set your preferred vacuum level by pushing one button. Battery option and quiet operation enable discreet pumping whilst on the go. 2-Phase Expression Technology Medela's product development is based on evidence-based research into a baby’s natural feeding behaviour. This has led to the development of 2-phase expression technology which mimics the baby's natural sucking rhythm to express more milk in less time. The 2-phase expression technology consists of: Phase One - Stimulation: A fast, light pumping rhythm to stimulate the milk ejection reflex and get the milk flowing Phase Two - Expression: A slower pumping rhythm to express milk gently and efficiently