TUTORIALS
https://youtube.com/playlist?list=PLUskUU-NvGqgL2XL2P3jkV4axNXJiDfk0

TROUBLESHOOTING
https://julietapp.blogspot.com/p/troubleshooting-general.html

This app allows you to play a sound when you turn the screen on or off.

Features and Benefits

• Persistent service: Background service.
Autostart on boot and after update
• No root
• Ability to set a custom ringtone
• Easy to use