What does the LED on my Jabra Evolve 80 mean?

The LED on the bottom of the left earcup will light red while the battery is charging. The LED will turn off when the battery is fully charged. If there is less than 2 hours of battery left when turning Active Noise Cancellation (ANC) on/off, the LED will light red (3 seconds). 

Note:
The battery powers the ANC and Listen-in functions.