The way Holey Light works is quite simple: just activate the tab to adapt the edge of your camera as an LED for notifications. This makes it so whenever you get a message a circle of color blinks over your internal lens.
One of the bad things about Holey Light is that the tool needs the screen of your smartphone to be on to be able to display this animation. You can only see the LED when the device is charging, so the energy consumption when using this app increases.
With Holey Light you can simulate a practical LED for notifications on your Samsung S10, in all of its variants, so you don't miss out on new activity on your device. You can even use this indicator to be notified when your device is running low on battery.