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Sonoff 4CH Pro R2 input voltage

I've got an Sonoff 4CH Pro R2 and need to use the 5-24VDC input. But when i add 11.15VDC it wont turn on the Sonoff 4CH Pro R2. When i try with a 12VDC Transformer it works as i should, can somebody tell me what there is wrong?!

What will happen if you switch plus and minus? would the item burn off, or could it register it? 

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