What a nice trick! Interesting that dust guards doesn't block it, wonder if it is direct momentum transfer or heat expansion in the target material that drives the signal...

They have a pretty nice website for this trick too: https://lightcommands.com/

"Researchers in Japan and at the University of Michigan said Monday that they had found a way to take over Google Home, Amazon’s Alexa or Apple’s Siri devices from hundreds of feet away by shining laser pointers, and even flashlights, at the devices’ microphones."