TalkBack

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. Developer-built apks can be downloaded from the website if the
version that was pre-installed needs updating.

It's only activated if you explicitly turn on Accessibility:

1. Go to Settings


2. Select Accessibility


3. (Android 3.2 and earlier) Enable Accessibility checkbox


4. Enable TalkBack checkboxes


5. (Android 4.0 and later) Enable explore-by-touch

See the
FAQ or the Eyes-Free blog for more on Android
accessibility.

---