This breast enlargement system is a great way to increase the breast size, enjoy suction play and increase sensitivity. Simply place the cups over the breast and work the attached auto pump by pressing the left button until the vaccum reaches the desired level. Press the right button when ready to release the suction. You can increase and release air until the desired pressure/suction level is reached. The pump can also be used with any other compatible pumping system that uses the same generic valves and hoses. Exercise care when using any pumping device and cease operation immediately if discomfort is noticed.Do not use for prolonged periods of time or at excessive levels of discomfort. Features: Quality Breast Pump with Automatic Battery Pump and Quick Release Valve 2 ABS Breast Cups (Lined with silicone sleeves for comfort) Size: Medium Cup diameter: 11cm, Cup height 10cm Silicone Hoses and QR Valves (Hose can be detached from each breast cup valve whilst cup retains inner pressure) Automatic Pump Requires 3 x AA Batteries (Not Included)