Answer:
The LED-Photodiode Board within the MAXREFDES101# is assembled with one green LED and two photodetectors.
If you need an arrangement with different or more LED colour(s) we advise to modify the LED-Photodiode Board or replace it with a custom made one.
The MAX86141 assembled on the Sensor board supports up to 3 LED channels and two PD channels.
The MAXREFDES101# can be easily dismantled by removing the 4 screws holding the casing together. Then disconnect the sensor board and modify it to your needs.