This is not an official app by Google.

Control your Android TV / Google TV device from your phone. This remote control is simple, complete and ergonomic.
It supports latest updates of Android TV.
You can easily start your favorite apps directly on your TV thanks to an apps list or directly through voice recognition.

The app finds your Android TV device on your Wi-Fi network.
Your phone must be connected to the same Wi-Fi network as your Android TV device.
You can now control your Android TV device from anywhere in your home.