Battery level indicator
Short answer
The battery level indicator shows how much battery you have left on your speaker.
This is how the battery indicator of your Kilburn II works:
- The indicator shows how much battery you have left on your speaker. 
- It is dimmed during normal operation to save power, but it lights up as soon as you turn any knob. 
- When you charge the battery, the indicator displays the charge level with a rising animation. 
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