If you constantly miss out alerts on your iPhone, a feature can put an end to this. You can simply use your LED flash for notifications wherein your phone's torch is used to notify you.
The feature only works when your device is locked. When you're using it, you'll get regular alerts on your iPhone.
You can use the same settings to enable flash for notifications on your iPads - 6th generation iPad Mini, 2nd generation 12.9-inch iPad Pro, 11-inch iPad Pro, 10.5-inch iPad Pro, and 9.7-inch iPad Pro.