[washadjeffmad]

Variations might be better for underwater or surface impact detection, but for now, congrats to them on the reinvention the 1950s Zenith ultrasonic remote.

https://www.guinnessworldrecords.com/world-records/385428-fi...

My grandfather used to love to show off how he could jingle his keys to turn on his TV.

Also, without regulating the ultrasonic frequency space, I imagine this would be prone to interference from other devices already employing ultrasoud, today, like Google Home.

https://support.google.com/googlenest/answer/9509981?hl=en

"Why does Google flush all of my donors' smart toilets whenever I tap my champagne glass before a toast?"