The free Amazon Fire TV mobile app for Android enhances your Fire TV experience with simple navigation, a keyboard for easy text entry (no more hunting and pecking), and quick access to your favorite apps and games.

It features:
• Voice search (not available in all countries)
• Simple navigation
• Playback controls
• Keyboard for simple text entry
• Quick access to your apps and games
• Fire TV Recast support
Compatibility:
• Multicast-enabled router required
• Designed for simple navigation and playback control of Fire TV streaming media players
• For gameplay, use the remote included with your Fire TV or the optional Amazon Fire TV Game Controller

By using this app, you agree to Amazon’s Conditions of Use (www.amazon.com/conditionsofuse) and Privacy Notice (www.amazon.com/privacy).

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Source: https://play.google.com/store/apps/details?id=com.amazon.storm.lightning.client.aosp