Starts playing automatically every time you open the app to save you an extra second because you have a lot on your hands already.

You can leave the phone close to your baby and turn off the screen or you can check your favorite apps, the sound will keep on playing while the app is in the background

If you are on the move and the phone is in the stroller, you can turn the noise off or on from your Apple Watch.

Pick one of the four calming sounds:
Static noise
Rain
Vacuum cleaner
Wading machine
The app will remember your choice.