Also used for other purposes. Consumers would never consent to it if they understood it. https://www.wired.com/2016/11/block-ultrasonic-signals-didnt-know-trac

Also used for other purposes. Consumers would never consent to it if they understood it. https://www.wired.com/2016/11/block-ultrasonic-signals-didnt-know-tracking/ https://www.wired.com/2016/11/block-ultrasonic-signals-didnt... https://arstechnica.com/tech-policy/2015/11/beware-of-ads-that-use-inaudible-sound-to-link-your-phone-tv-tablet-and-pc/ https://arstechnica.com/tech-policy/2015/11/beware-of-ads-th... https://www.theatlantic.com/technology/archive/2015/11/your-phone-is-literally-listening-to-your-tv/416712/ https://www.theatlantic.com/technology/archive/2015/11/your-...