Perfect for pumping on the go, no need to worry about finding an outlet.nSpare unit for work or travel, use 6 AA battery.nCompatible/Interchangeable with Medela Pump In Style Advanced Breastpump.nFor Bellema Melon model (XN-2203H2), NOT for Effective/Mango/Mango Plus models.nBellema Melon Double Electric Breast Pump Replacement Parts. FDA Approved, BPA Free.