knowing RF from sensor

[jorge gomez]

hi to all new here i am seveal door sensors that i am not using from an alarm system that i currently have. Is there a way to know what RF are they transmiting so i can used them for my project
Thanks

[daulagari]

What is the brand of these door sensors? A photo can also help.

But unlikely you can use them out-of-the-box with MySensors...