Dear Andreas, the smart plug needs 230V to work. The smart plug doesn't have its one battery or internet connection. What this means, if I have a power failure at home all my smart plugs stop working, but the alarm which works on batteries and the back-up GSM module keep working. To hopefully ...

Thank you for the post and the great idea.
I have a question about the 2-channel transmitter you just, nexa wbt-912.
This looks like a local product from Finland, do you think it is possible to use a qubino for this also?