The idea is to provide users with information about, time, date, notifications and more and all without having to touch the phone. Just by looking at it.
Camera permission
The app needs camera permission to toggle the flashlight
Phone permission
The app needs phone permission to recognize incoming calls, dismiss the always on screen and show the incoming call screen.
Modify system settings permission
The app needs permission to modify system settings to change the brightness of the lock screen.
** Note: For Xiaomi devices you will need to access the Security App -> Permissions -> Permissions -> Always On AMOLED -> Display pop-up window permission and Show on Lock screen.