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I need a wireless switch with capability to report current state, so I would like to modify a wireless switche like this, by replacing a current state LED by a trasmitter to get the state of current wirelessly.

it is possible to make such hack? what kind of transmitter could be used ?

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I don't think enough information is provided for your specific use-case to give a comprehensive or definitive answer. I would be inclined to say yes; buy an existing transmitter, open it up and study it.

I would imagine a transmission is triggered by having the push-button close a circuit, allowing a current to flow. This could be replicated in your current circuit by replacing the LED with a transistor switching circuit, affecting the current across the push-button switch.

It would be much less tedious to use an existing transmitter/relay set than to try and implement your own

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