Perks \tOverflow protection \tVacuum suction range: 50-250mmHg \t2-Phase Expression technology uses Stimulation and Expression phases to mimic your baby\u2019s natural nursing habits. This is especially helpful for preemie moms and babies \tLet-down button allows you to return to the Stimulation phase after beginning the Expression phase \tDouble or single pumping options \tThe rechargeable battery option allows you to bring the pump with you \u2014 a feature not often associated with hospital-grade pumps This Pump is Perfect For\u2026 Moms on-the-go \u2014 This is a perfect option for moms who plan to be out and about and will need to pump. The breast pump is lightweight and is easily stored in a briefcase or carrying bag. What\u2019s Included \t(1) Bottle stand \t(1) Protector for card\/cord \t(2) Rechargeable batteries \tPower: 100-240V - 50-60Hz .5A \tDC Power: 12V DC (25W) \t(1) Symphony 2.0 program card \t(1) Quick-start card \tInstructions What to Look Out For While this hospital-grade pump has an available rechargeable battery, it is important to note that the carrying case must be purchased separately to truly make this an on-the-go pump. Additionally, the breast pump kit (bottles, flanges, etc.) must be purchased separately.