Center the breast shield on your nipple so that the nipple fits freely in center of tunnel opening.
Press the power button. The screen will light up.
Your pump starts in expression mode.
If your milk is not flowing, press the 3-wave button above the power button to switch to massage mode. Massage mode helps facilitate your let-down. Some moms will get a let-down in 30 seconds, and others will take a couple of minutes. You can massage the breast to help stimulate your let-down as well. The massage mode is set to 70, and is not adjustable. Once your milk starts to flow, press it again to go back to expression mode.
Use the +/- button to adjust the vacuum and cycle to a comfortable level. Find the right combination vacuum/cycle best for your body.
After you achieve let-down, you will want to press the three-wave button to put it back into expression mode. In expression mode, you will be able to adjust the cycles every minute, up or down, going between 38 and 54 cycles/minute. You can adjust the suction strength from level 1 to 12 which is measured in mmHg: level 12 will reach 250mmHg.
Some moms can get multiple let-downs, so going back and forth is recommended if needed.
To stop expressing, press the power button. Next, remove the milk collection kit from your breast.
Twist to detach the backflow protector from the breast shield. Remove the breast shield from the milk collection bottle and close the bottle tightly with the bottle lid and store safely.
The S2/S1 will remember your settings automatically for your next session. If you want to start pumping on different settings than those that you finished with in your previous session, adjust the settings before you start expressing.