Wireless temperature sensor module

Hello guys,

I’m create my first magic mirror.
I’ve find in the 3rd party module list a nice module with the name “MMM-temp-ds18b20”.
My problem is that I don’t know how I can realize this. Because to practise this nice idea I need some wireless modules which send the temperature information to the Raspberry Pi.

Maybe someone of you has do this in former times and can gave me some tips?

Thank you for your help and many greetings
tzabbi