There are 4 LEDs on the top of the Moby/8500 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.