Designed for comfort, output, and ease of use with an efficient tug-and-release latch Fully in-bra with a discreet low profile and shape that mimics the breast — no cords, tubes, or external motors 15 levels of customizable, hospital-grade suction (up to -280mmHG per side) App-controlled with ability to input milk volume and access to expert-backed content and services Compatible with 5 oz or 7 oz breast milk storage containers for ultimate flexibility Rechargeable battery that lasts up to 3 pumping sessions Dishwasher-safe parts for easy cleaning Clinically tested, FDA approved, and made without BPA for a safer pumping experience This is a medical device and therefore it would be recommended you purchase new replacement parts from the website. The 21 flange included is new and unused. All parts replaced will cost about $40 new from the Willow website