The LEDs on the Zohn 2 earphones show their current status:
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Power on: flashes twice
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Pairing: slow flashing light
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Connected: solid for 2 seconds
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Low battery: flashes twice every 5 seconds
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The charging-case LED shows the case battery level:
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Red: 0–20%
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Yellow: 20–80%
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Green: 80–100%