Built-in Feature: Android 5.1.1 (Lollipop) - Google Nexus 7

Switch Control

Enables the user to control the device using one or more switches. To use this feature, the user can use an external switch, an external keyboard, or built-in buttons on the device.

Detailson: Switch Control
Built-in Feature: Android 5.1.1 (Lollipop) - Google Nexus 7

TalkBack : Screen reading

Gives spoken feedback on actions, alerts, and notifications.

Detailson: TalkBack : Screen reading
Built-in Feature: Android 5.1.1 (Lollipop) - Google Nexus 7

Text-to-speech output : Text-to-speech

Customize the settings for the device’s text-to-speech feature such as text-to-speech engine, speech rate, and default language.

Detailson: Text-to-speech output : Text-to-speech