LCD Display provides status of programs and functions. Control suction and speed to suit your comfort level with a total of 28 pumping state options. 2 Phase Expression; Stimulation and Expression Mode. Includes 2 Soft Silicone Cushion Inserts for Optimum Comfort. Easy to assemble and clean; silent for discreet pumping. Anti-backflow system prevents milk from entering motor. Single or Double Pumping Options; BPA and Latex Free. Two 4oz Bottle Feeding Adapter Kits and Storage Containers with Lids. Piston Pump System imitates baby's sucking rhythm. Includes A/C Power Supply & External battery pack; 6 AA alkaline batteries.