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1 CHANNEL INCHING /SELF-LOCKING - will it retain state when the device power is off

If some one can help/clarify me here please. I could have buy one and test is myself, but its a long wait in the postage to arrive.


I am looking for 1 CHANNEL INCHING /SELF-LOCKING Device. Wanted to know will it retain state when the device power is off.


I have a situation, when relay is ON, even when device lost it power, I wanted to keep the relay in same state ON. 


I am confused with the term Self-Locking. 

Appreciate any explanation.


As far as I know all Sonoff devices "latch" electronically and not mechanically.  Meaning that with no energy available the relay will de-energize. 

Thanks E W. Appreciated your quick response. 

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