Google is testing a way to activate Assistant without wake words – Engadget

It’s unclear whether Google has plans to bring the feature, which is codenamed Blue Steel, to the public version of the firmware. It merely appears to be in testing for now. Nor is it completely clear how the feature works. However, Nest devices have ultrasound capabilities that can help them detect how far away you are without activating the camera. 
Whether Google uses ultrasound or the Nest camera’s facial recognition function for Blue Steel, you can turn off those features on the smart display…

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