Wireless bell trouble
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## Alarm system
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MG5050 + IP150

## Environment
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Windows, Linux, RPI...
Python version
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3.6.1

### Git branch
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3.6.1

## Question
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Which supposed to be the low battery wireless bell trouble? (on the keypad 2 - 9). How can I tell apart if power_trouble happens because of bell or something else?

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