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TalkBack, Kickback, and SoundBack are apps for the Android Accessibility Service to help blind and vision-impaired users use their devices more easily.
These apps add spoken, audible, and vibration functionality services to your device. They are system applications that were pre-installed on most device and are updated when the accessibility service is improved.
These apps only get activated if you explicitly turn on Accessibility.
Steps to activate Accessibility:
1. Go to Settings
2. Select Accessibility
3. Enable Accessibility checkbox
4. Enable TalkBack, KickBack, SoundBack checkboxes