How does slot machine EMP jammer work

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Does EMP slot jammer really work? It is considered a small device that can be quite difficult to detect sometime If you want to prevent the

This man was caught cheating using an EMP jammer to steal money from this slot machine A button to activate it Comes with a little mini screwdriver, little antenna like this I'm gonna try

4 fantastic fish slot Emp Jammer Device - Emp Jammer Kit jammer cheat device $ $ ; IPHONE TYPE EMP JAMMER SLOT MACHINE ANTI ALARM HIDDEN ANTENNA $ Do emp jammers work on slot machines