The App Is Genius
Because you can't see the milk flowing into the bags, you need to sync the pumps to an app on your phone. When you're ready to pump, you can open the app to track how many ounces you've pumped from each breast and receive alerts if your milk bag is full or you have poor suction. The app also tells you the battery life of each pump and, perhaps most importantly, tracks all of your past pumping sessions so you can see the amount pumped and total time spent pumping.
The app is currently only available for iOS, but the company plans to offer an option for Android users in the future.