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Shopping cart wheel unlock/lock files

Credits to jdmoore#4658 for modifying the files to work on the FZ
Original files from: https://www.begaydocrime.com/#

How it works

Most electronic shopping cart wheels listen for a 7.8 kHz signal from an underground wire to know when to lock and unlock. A management remote can send a different signal at 7.8 kHz to the wheel to unlock it. Since 7.8 kHz is in the audio range, you can use the parasitic EMF from your phone's speaker to "transmit" a similar code by playing a crafted audio file.