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I am using Sonoff 4ch pro to control the roller shutter up and down

I am using sonoff 4 ch pro to control w roller shutters for up and down .

How to connect the normal switch of the shutter to sonoff 4 ch pro so I can use both the application to control the shutter and also use the normal switch .

What is the connection diagram and what is the best switch which fits this function ?

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