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What do the LEDs on the 3-in-1 card reader mean?

Here is the significance and usage of LEDs on the 3-in-1 card reader

  • First LED flashing - the device is connecting with your smartphone/tablet
  • First LED on - ready for use
  • 4 LEDs on in consecutive order - successful reading NFC payment
  • One "beep" sound - the transaction is complete
  • Two "beep" sounds - indication there was an error
  • All LEDs off - power is off or no power