The card is equipped with two low-power LEDs.

The blue LED functions as a user LED and serves solely as an indicator; for example, it can be illuminated when the card is performing calculations.

The white LED is connected to a branch of the GNSS module, specifically the TIMEPULSE pin. This pin is in a high state when the GNSS module receives satellite signals, thus turning on the LED. However, it can also be controlled by the microcontroller.

Therefore, with this pair of LEDs, it is possible to provide the user with different indications based on the illuminated state of the LEDs.