PUMP, BREAST ADV SNGL ELEC (6/CS) Perfectly Pure™ closed system design prevents milk backup and cleans easily Advanced Fit™ flange system - 6 different sizes available, 2 flange sizes included Perfect Position™ designed for slouch-free pumping Compact, lightweight, one-hand design with easy fingertip control offers quick on/off and customizable vacuum The Advanced Single Electric Breast Pump can be powered by the provided AC adapter or 3 AA brand name batteries (batteries sold separately)