These are the different colors you can see on your eVscope LED:

Red: the eVscope is ON and working well.

Blue and blinking: the eVscope is off and charging. It will blink from 6 times (fully discharged) to constant blue (fully charged).

Yellow and blinking: the eVscope is being updated.

Green (for 1 minute) : The data transfer succeeded.

Orange (for 1 minute): The data transfer failed.

Green and blinking : upload in progress 

Purple: the eVscope embedded software is turning ON or OFF.

Purple and blinking 5 times : eVscope is OFF and doesn't have enough charge to turn ON. You need to charge it.

White: an error happened. You should reboot your eVscope.