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

From version SoundBack 1.1.3:
(Android 1.5+)
Latest: 1.0.0 on January 17, 2015
(Android 1.6+)
Latest: 1.1.3 on February 4, 2016
All versions
February 4, 2016
January 17, 2015