Medela Brings The Iconic Swing Maxi Flex™ Into The Modern Age With A Contemporary And Stylish Redesigned Swing Maxi. Improve Your Mobility Thanks To The Built-In Rechargeable Battery That Lasts For Up To 6 Pumping Sessions. And Continue To Benefit From Medela’S Flex™ Technology That Offers You Flexibility And The Comfortable, Efficient Pumping Experience You Deserve.