It’s already been proven home cyber assistants such as Alexa are not all that secure as conversations are often recorded by the companies, but now cybersecurity researcher Takeshi Sugawara and a team of researchers have proved that they can be hacked into easily with a laser light. 

Sugawara, working out of the lab of Kevin Fu while was visiting at the University of Michigan from the Tokyo-based University of Electro-Communications, discovered this disturbing glitch. He, along with Fu and a group of University of Michigan researchers found they could use “lasers to silently “speak” to any computer that receives voice commands—including smartphones, Amazon Echo speakers, Google Homes, and Facebook’s Portal video chat devices. That spy trick lets them send ‘light commands’ from hundreds of feet away; they can open garages, make online purchases, and cause all manner of mischief or malevolence,” Wired reported.

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“It’s possible to make microphones respond to light as if it were sound,” says Sugawara. “This means that anything that acts on sound commands will act on light commands.”

Using the lasers, the researchers could get the devices to do a number of potentially dangerous things, such as open house and garage doors. 

“The researchers, who studied the light flaw for seven months, said they had discovered that the microphones in the devices would respond to light as if it were sound. Inside each microphone is a small plate called a diaphragm that moves when sound hits it,” The New York Times reported.

According to the researchers, they notified Tesla, Ford, Amazon, Apple and Google to the light vulnerability. The companies old the Times they were studying the conclusions.