First, the battery indicator appears. If all LEDs are lit, it means that the battery is full .If 2 LEDs light, that means that the battery is half full.
If 1 LED is lit, this means that the battery is 1/4 full. If all LEDs flash quickly, then you should replace the battery.
Then the status of the daily goal appears. Red means that the daily goal has not been achieved yet. Yellow means: close to the target. Green means goal for the day has been achieved.