Hi Forum!

​​​​​​SI basically my alarm system doesn't work. When I press the button on my remote, nothing at all happens.
I vaguely remember reading a while ago that the alarm has batteries that go bad and can be replace?
Is that the way to go? If so how do I get to it.
Or would you recommend replacing the whole alarm unit?

Is there a video/pictures to be found somewhere?
Thanks for your replies.

Tommy