Geek Trivia: What Common Electronic Device Was Once Remote Controlled By Ultrasound? 00:02:00 What Common Electronic Device Was Once Remote Controlled By Ultrasound? Turntables Garage Door Openers Hi-Fi Stereos Televisions Think you know the answer? from How-To Geek http://bit.ly/2IUATOa via IFTTT Twitter Facebook Google Tumblr Pinterest
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