Geek Trivia: What Common Electronic Device Was Once Remote Controlled By Ultrasound?

Share
Technology

What Common Electronic Device Was Once Remote Controlled By Ultrasound?
  1. Garage Door Openers
  2. Hi-Fi Stereos
  3. Televisions
  4. Turntables

Think you know the answer?

Source : Geek Trivia: What Common Electronic Device Was Once Remote Controlled By Ultrasound?

You may also like...