THIS IS WHAT YOU SHOULD KNOW WHEN PAYING WITH YOUR CREDIT CARD
2.No button highlights
A skimmer that was inserted too quickly may block the button highlighting on the terminal.
3.Green LED light is blocked
An attachable skimmer also blocks the green LED light that should be on when the terminal scans a card.
Frequent operation errors
Skimmers sometimes get in the way of the magnetic strip when they scan data. This results in more operation errors and significantly slows down the normal workings of the terminal. So pay attention if a terminal operates much slower than it should.
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Source: wau
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