LED-indication: as default the led will light once when making a sensor reading and after successful upload of sensor data. This behaviour can be changed before shipment, in some devices it is disabled in order to save power.
Solid red for several minutes: the device has detected an error, contact support.
Flashing yellow: The device cannot connect to the cellular network.
Short red pulses: The battery voltage is too low, the device must be connected to a charger
Flashing multicolor, the device has successfully uploaded sensor data
During normal operation you may see other colors as well, these are the main important status codes to monitor