The Sweet Essence Manual Pump is a light weight and travel-friendly pump for busy women. Easy to clean and easy to use with an adjustable suction level, Sweet Essence is perfect for mothers who want complete control over their milk expression. Easily operated with one hand, the Sweet Essence Manual Pump provides two levels of suction strength to customize your milk expression. The vacuum adjustment knob located on the pump"s diaphragm allows you to manually adjust the pump"s suction strength to best imitate your baby"s nursing pattern. Each Sweet Essence Manual Breast Pump Kit includes: -Manual Pump Diaphragm Kit -Expression Collection Kit -Two Bottle Adapter Kits -Convenient Carrying Bag -One extra 5 oz. Collection Bottle -Spare Parts (One-Way Valve & O-Ring) -User Instructions & Assembly Manual