LAS VEGAS — Smartphones, virtual-reality headsets, toy robots, quadcopter drones and self-balancing scooters can be hacked by powerful sonic blasts, a team of Chinese researchers demonstrated at the Black Hat security conference here last week. Sound at exactly the right pitch (or multiples of that pitch) will cause the structure to vibrate strongly, much like a guitar string. The HTC Vive and Microsoft HoloLens headsets did a bit better; their screens merely wobbled and shook as the sound waves hit them. An ultrasound emitter held near the drone made the propeller motors spin at different rates. If you see drones suddenly falling out of the sky, you'll know why.

Source: Fox News July 31, 2017 16:52 UTC