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**Note 12/28/19: The lock company notified me that they’ve updated their software to lock the user out after 4 incorrect attempts to enter a PIN.**
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This work was performed by a team of researchers at the University of Michigan and University of Electro-Communications in Japan. For more information check out their website http://lightcommands.com or contact them at firstname.lastname@example.org
Here’s one of the microphones on DigiKey
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