Spectra's SG portable breast pump is distinguished by its double adjustability: Independent vacuum preset cycle settings are available for each breast Manufactured with Natural Nursing Technology that simulates the natural way a baby suckles and promotes a more comfortable pumping experience Other features include a closed system which prevents backflow into tubing or pump and a touchscreen LCD with timer control Ultra quiet breast pump is rechargeable – portable with built-in battery Breast pump comes with two 24-mm Spectra breast flanges; two 28-mm Spectra breast flanges; two Spectra backflow protectors (includes silicone membrane, uppercase, and lowercase caps for each backflow protector); two Spectra duckbill valves; two Spectra tubes with adapter ends; two Spectra wide neck storage bottles (includes nipple, disc, cap and cover for each bottle); and a Spectra 5V AC power adapter/charger Package/UOM: Each (EA); manufacturer item MM011450.