Now that we understand how to set up a basic notification, let's get into some more features that we can offer. Some of these features were introduced in iOS 11 and some were introduced in iOS 12. I will make sure that I note which features are from which OS. The first feature I want to talk about is a new iOS 12 feature. Deliver quietly allows users to have more control over their notifications, but Deliver quietly only sends notifications to the Notification Center. Let's look at how this works.