Drive Medical GentleFeed Dual Channel Breast Pump MQ9120 Features and Benefits Highly efficient in expressing breast milk Simple button operation and clear LCD screen to display pumping state Easy to assemble and clean Choose from single or double pumping Choice of stimulation or expression modes Control suction and speed to suit your comfort level with a total of 28 pumping state options Piston pump system imitates baby's sucking rhythm Comfortable and painless while pumping Silent for discreet pumping (BPA) Free Includes two soft silicone cushion breast cups Anti-backflow system prevents milk from entering motor Includes bottle feeding adapter kit and storage containers with lids May be powered with four AA alkaline batteries or the included A/C power supply