Android Accessibility Suite is a collection of accessibility apps that help you use your Android device eyes-free or with a switch device.

Android Accessibility Suite includes:
• Accessibility Menu: Use this large on-screen menu to lock your phone, control volume and brightness, take screenshots, and more.
• Select to Speak: Select items on your screen and hear them read aloud.
• TalkBack screen reader: Get spoken feedback, control your device with gestures, and type with the on-screen braille keyboard.

To get started:
1. Open your device's Settings app.
2. Select Accessibility.
3. Select Accessibility Menu, Select to Speak, or TalkBack.

Android Accessibility Suite requires Android 6 (Android M) or later. To use TalkBack for Wear, you'll need Wear OS 3.0 or later.

Permissions Notice
• Phone: Android Accessibility Suite observes the phone state so it can adapt announcements to your call status.
• Accessibility Service: Because this app is an accessibility service, it can observe your actions, retrieve window content, and observe text that you type.
• Notifications: When you allow this permission, TalkBack can notify you about updates.

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Source: https://play.google.com/store/apps/details?id=com.google.android.marvin.talkback