The eufy Wearable Breast Pump S1 offers a hands-free, discreet pumping experience. This package includes a 24mm flange size, with 17mm, 19mm, and 21mm inserts to customize the fit for optimal comfort and milk expression. A built-in heating function helps stimulate milk flow. It comes with a convenient storage pouch. A free tote bag is also included for easy transport and storage of the pump and accessories.