So, you want a Medela electric breast pump - after all, it is the gold standard - but you're watching your budget? You'll love the Swing™ Breastpump, Medela's smallest, lightest, most-affordable electric breast pump! This single breast pump features Medela's exclusive 2-Phase Expression(R) technology for efficient pumping. And it's so compact and portable, you can clip it to your belt, or even hang it off your shoulder. Swing includes all the accessories you need to get started (including a bottle stand and two breastmilk bottles). All housed in a portable drawstring bag. AC adaptor included, or takes 4 "AA" batteries (sold separately) for pumping on the go. The Swing breast pump features Medela's 2-Phase Expression(R) technology which mimics a baby's natural nursing patterns. A light, fast stimulation phase is followed by a deeper, slower expression phase. Pump weighs less than 1 lb. (about 10 1/2 oz.) and is just 5" in diameter Swing accessories include: 24 mm PersonalFit™ breastshield, valve, 3 membranes, tubing, and optional-use neck/shoulder strap Includes these breastmilk storage supplies: bottle stand, two 5 oz. breastmilk bottles, with lids and travel cap, and a wide-base, slow-flow nipple Includes AC adapter, carry bag, and instruction manual All parts that come into contact with breast milk are BPA-free