Attached you'll find a list of what each LED color means if displayed on the Ember Mug.
Color Light Index
SOLID RED - Ember has low battery and will be unable to maintain the set temperature.
PULSING RED - Ember is charging on the plugged in charging coaster (Ember must be empty)
SOLID GREEN - Ember is fully charged
PULSING WHITE - Once hot liquids are poured in the Ember, the Ember will pulse white as it works to reach your set temperature.
SOLID WHITE - Target temperature has been reached and the beverage is ready to be enjoyed!
PULSING BLUE - Pair mode. After the Ember's power button is pressed for 5-7 seconds, the Ember will pulse blue to indicate it is in pair mode.
SOLID BLUE - When a user selects to update the Ember's firmware via the Ember App, the Ember will show a solid blue light while it is updating the firmware
BLINKING YELLOW GREEN - After pressing the power button for about 8-10 seconds, the Ember will flash yellow to indicate it is being reset.
Custom LED Color: Primarily, the Custom LED is there to know which Ember Mug belongs to who. We've seen that many people have multiple mugs in their household and being able to pick up the empty mug and or press the power button to see that it is their custom color helps our coffee/tea drinkers know which mug is theirs. It also allows the user to associate their specific temperature to their color, so they don't accidentally drink out of a mug that is not set to their perfect temperature. And lastly, it gives a personal touch to each mug and the owner using it.