Medela SwingFlex single electric breast pump is infused with patented and research-based 2-Phase Expression Technology. Through research, Medela has learned that there are two distinct phases of how babies breastfeed. The first phase, known as stimulation phase is when the baby first goes to the breast and sucks fast to initiate the milk flow. The second phase of expression occurs after milk flow or œlet-down begins. During this phase, baby breastfeeds at a slower suck rate for continued milk flow.FeaturesKey FeaturesEfficient Pumping With Clinically Researched Technology: As The World's Leading Brand In Breastfeeding Research, Medela Breast Pumps Are Designed To Re-create An Experience That Most Closely Resembles Baby's Natural Sucking Patterns And Speeds. The Swing Flex Breast Pump Comes With Clinically-researched Settings For Both Stimulation And Expression Phases Of Pumping, So That Moms Can Customize Their Pumping Experience, But Still Express Milk In The Most Efficient Manner.Easy And Comfortable Pumping: The Swing Flex Breast Pump Provides A Comfortable, Customizable Experience With Easy-to-use Controls. It Automatically Switches From Stimulation (Starting) Mode To Expression Mode After 2 Minutes, But You Can Switch Into Expression Mode Whenever Milk Starts To Flow. Pick From 11 Different Vacuum Levels Across Both Stimulation And Expression Modes For Your Desired Comfort.More Milk With Flex: The Innovative 105 ° Angle Of The Breast Shield Reduces Pressure And Thus Supports The Milk Flow. For 11% More Milk Than When Pumping Out With A Conventional Breast Shield.Easy To Use: Swing Flex Single Electric Breast Pump Features Four Simple Buttons To Easily Switch Between Phases, Up/Down Suction Strength And Switch On/Off Power. The Compact And Lightweight Design Make It Easy To Carry. Designed For Flexibility, The Breast Pump Offers An Ac Power Adapter Or Can Be Powered By Batteries.Easy To Clean And Disinfect: The Pump Is Intuitive And Easy To Assemble And Clean - All Parts Can Be Cleaned Easily In The Dishwasher Or With Soapy Water In The Sink. It Can Be Sanitized By Boiling, Using A Steam Sterilizer, Or In Medela Quick Clean Microwave Bags.All Parts Are Made Of Bpa Free MaterialsLoved By Moms, Recommended By Doctors: The World's Leading Brand In Breastfeeding Research, Medela Has Worked With Researchers In Breast Milk For Over 60 Years, And Is The #1 Choice For Hospitals And Healthcare Professionals Around The World. Our Multi-award Winning Breast Pumps And Accessories Are Used And Loved By Moms In Over 100 CountriesSpecificationsBrand - MedelaType - Breast PumpBottle Capacity - 150 ml Package Dimension Dimension - L 25 x B 27 x H 8 cItems included in the pack:1  Motor Unit2 Personalfit Flex Breast Shield (1 X Size S, 21 Mm, 1 X Size M, 24 Mm)1  Connector And Membrane1  Swing Flex Tube1 Bottle Holder1 Breast Milk Bottle ( 150 Ml)1 Power Adapter