A security specialist and "hardware hacker" named Andrea Barisani and Daniele Bianco, respectively, have demonstrated an $80 device they've cobbled together than can read which letters are being typed by measuring the vibration of a laptop. The system uses a laser beam and photo diode to shine and read the reflections of light trained on the laptop. They found that each key on the keyboard creates a unique vibration signature. The device works from up to 100 feet away. I want one. SOURCE
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