This is the main unit and tubing for the Medela Swing electric breast pump. You can easily adjust the suction strength with the four operation buttons. Recommended for mothers who use Medela for breast pumping but whose main unit has broken, or whose main unit's suction power has decreased, causing longer pumping times. A power adapter is not included. You will need to use the power adapter from your existing Medela Swing, or purchase AA batteries separately. - Brand: medela - Model Name: swing - Battery Type: 4 AA batteries - Operation Buttons: 4 buttons (Power, Suction Strength Adjustment) This is a pre-owned item that has been stored cleanly. Operation has been confirmed. Suction power is not an issue. Thank you for looking.