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This is a closed system, double electric breast pump with anti-backflow diaphragm. It is equipped with 3 Expression Patterns and 8 levels of suction control, giving the ability to mimic your babys nursing pattern*Small and lightweight (less than 0.7lb.) Total weight including accessories is merely 1.3lbs*User-friendly control, easy to understand LCD display*Features the clock, an alarm, and a memory function to record your favorite pumping pattern and recall it for future session*12V AC/DC powered, battery powered (4 AA batteries not included) or manual (Manual Add-On Kit included) The Rumble Tuff Serene Express is a double electric breast pump which combines the effectiveness of a hospital-grade pump with the convenience of a small, portable pump. It uses a closed-system diaphragm which prevents breast milk from coming in contact with the tubing or motor. With 3 Expression Patterns and 8 vacuum suction levels, the Serene Express can be easily customized to match your babys nursing habits. It is durable and dependable for daily pumping. It can be electric-powered, battery operated, or converted into a manual breast pump. The Serene Express is built with the memory ("M" button) which can be programed to remember your favorite pumping patterns and recall it for your future pumping sessions. The Serene Express has 3 Expression patterns: Reflex Expression, Swift Expression, and Natural Expression. The Reflex Expression is the first 15 cycles when the pump is first turned on. It imitates the way a hungry baby latches on with stronger suction. The Swift Expression is the fast and shallow pattern that imitates the nursing pattern of an infant or smaller baby. The Natural Expression imitates the long and deep suckling of an older baby. The Serene Express also features a Vacuum Adjusting Wheel that provides 8 levels of suction adjustment for each pattern, an easy-to-read LCD display, Clock, and Alarm functions for next pumping session. It comes with a 120-day warranty and a 1-year extended warranty for the pump motor (wearable accessories excluded). All Rumble Tuff pumps and parts are BPA free. The Serene Express is a winner of 2014 Family Choice Award. Each Serene Express includes: (1) Electric Breast Pump Main Unit, (2) Expression Collection Combo Kits, (1) Manual Diaphragm Add-On Kit, (2) Bottle Adapter Kits, (1) 12v AC/DC Power Adapter, (1) Double Vacuum Tube with Adapter, (2) Spare Parts (One-Way Valves and O-Rings), (1) Convenient Carrying Tote, and (1) User Instruction & Assembly Manual