The Medela Swing Breastpump is a portable, lightweight single electric breast pump with 2-Phase Expression Technology produces more milk in less time when pumping at Maximum Comfort Vacuum in the expression phase. Wonderfully compact pump can be taken anywhere, it even fits neatly in your purse! The Medela Swing breast pump comes with a belt clip and neck/shoulder strap to make mobile and tabletop pumping easier. The convenient drawstring bag helps keep the pump's components organized and clean. Requires four AA batteries (sold separately) for portable use, and includes an AC adaptor.