Amazon's Echo is hearing you all the time, and that isn't necessarily a good thing. The device can randomly order items you don't want, record conversations, and has raised several privacy concerns.
But there is a way to shut off Echo through voice commands. A hardware hacker, Shawn Hymel, has created an innovative kill switch that can accept voice commands to shut off the device. The kill switch is a circuit board attached to Echo via a USB port.
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