Swing is ideal for moms who need to pump occasionally while nursing most of the time. Swing is the smallest and lightest single electric breast pump on the market. This versatile and easy to use pump is so quiet that you can pump anywhere, anytime, even while nursing!Medela’s Swing™ Pump is the smallest and lightest single electric breast pump on the market. Swing is easy to use and so quiet you can pump anywhere, anytime even while nursing! Swing™ is designed for occasional use and offers a battery operated option, making it ideal for moms on the go or for moms who want to pump while nursing. Swing™ features Medela’s patented 2-Phase Expression® technology, scientifically proven to produce more milk in less time*. Comes with Medela’s Calma® nipple, scientifically proven to make switching from breast to Calma and back a breeze. All parts that touch breastmilk are made without BPA, DEHP and other phthalates. Included: 1 x Calma® nipple 2 x 150ml bottles with lids (BPA-free) 2 x PersonalFitTM breast shields (Standard size 24mm) 1 x drawstring carrying bag *Why is Medela’s patented 2-Phase Expression technology important? Research shows that babies feed with two distinct phases. Stimulation phase - when babies first go to breast, they suck faster to start the milk flowing. Expression phase - after milk flow or "let-down" starts, babies breastfeed with a slower, deeper suck to remove milk. By mimicking this behaviour, Medela`s patented 2-Phase Expression® technology is proven to produce more milk in less time when pumping at Maximum Comfort Vacuum™ in the expression phase. For hygienic reasons, breast pumps cannot be returned once opened. This is a single user product. Use by more than one person may present a health risk, affects performance, and voids the warranty.