Is my Optima XM burglar alarm working?

Hi, my Dad has an 'Optima XM' burglar alarm in his new-ish house and i'm almost certain he has never used it, the state of the alarm is dusty and looks dead,
there is no light to indicate if it is on or off and the sensor for the alarm doesn't flash red when I move infront of it,
also, the rubber keypad needed to type in your 4 digit code has been taken out the front of the alarm somehow and is just a rubber keypad that is separate from the box, so you wouldn't be able to set a code or type it in, am I right??!
it doesn't make any noise at all when I press any buttons on the keypad, even when I push it onto where it should be on the alarm itself, I need confirmation that this alarm 100% doesn't work,
it's sound complicated I know, but help is much appreciated!!
Asked Dec 18, 2015

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.