https://techcrunch.com/2017/09/28/google-assistant-turns-nvidia-shield-tv-into-a-hands-free-smart-device/

Nvidia Shield TV, the Android TV-powered smart TV streaming box that offers 4K and more, now also includes built-in support for Google Assistant. Nvidia’s integration of Google Assistant was first revealed way back in January, but the feature was announced as something that would be coming later. Now it’s arriving to Shield devices courtesy of Nvidia’s 6.0 software update.

The update also brings always-on hands-free voice activation for Nvidia Shield, which is enabled by way of the Nvidia Shield game controller. This packs in sensitive microphones, which are passively listing for the “OK Google” wake word thanks to the new update. That means you can just say the magic words when nearby those control devices to wake up your Nvidia Shield TV and issue voice commands directly to Assistant, the way you would with a Google Home or with your Pixel smartphone.