There are 4 LEDs on the top of the Reader used to indicate progress of a transaction.
- Blue – For contactless transactions, indicates that the Reader is waiting for card. The Reader will also beep, indicating you should swipe or tap the card.
- Yellow – Indicates the Reader is reading the card.
- Green – Indicates the card read was successful.
- Red – Indicates a card processing error.
Note: The yellow and green lights turn on and off quickly.