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Thieves... Acoustics and physics are at work to stop your activity. Just in case, the Employment...
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The Hidden Acoustics Behind Anti-Shoplifting Tags

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Thieves… Acoustics and physics are at work to stop your activity. Just in case, the Employment Agency is the second street on the left!

The technology to stop thieves is called: acousto-magnetic strips.

These strips contain two pieces of metal, a magnetized and the other a solid piece of iron nickel alloy.

A frequency of 58 kHz is used to oscillate one of the strips.

A very good article by Vice Magazine!

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Vice
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