TalkBack is an Accessibility Service that helps blind and vision-impaired users
interact with their devices more easily.
This application adds spoken, audible, and vibration feedback to your device.
It comes pre-installed on many devices so you won't be able to install this if
that is the case.
It's only activated if you explicitly turn on Accessibility:
• Go to Settings
• Select Accessibility
• Enable TalkBack checkboxes
For Android older then 8.0 use version 5.0.7_aosp.
For Android newer then 8.0 use version 2021-04-23.