Icons are available in square, round and transparent.
This is a widget program, please add the widget to your home screen to use.
It is recommended that users after Android 6 use the foreground service to keep the widgets updated instantly. If you don't want to see the foreground service appear in the notification field, please long press the notification and set the notification not to be displayed (the vendors may be slightly different).
Postscript: I test on redmi note 7. It's work fine with Android 9 MIUI 10.