The EM1206 features four onboard status LEDs. The LEDs are strategically positioned on the edge of the module's board. Your product can have a small window or opening on its cover to make the LEDs of the EM1206 visible from the outside. When the EM1206 is used in combination with the RJ203 module, the status LEDs are visible through a transparent portion of the RJ203's housing.
Further information on status LEDs can be found in Status LEDs.