Alarm sensitivity

My alarm goes off alot, the wind can even set it off. i know that you can turn down the sensitivity and i tryed to look for the black box with the white knob under the dash, but all i found was the black box with no knob on it. The box said mazda security system on it, is that right? any ideas?
 
There is another smaller black box with a small white knob on it. It took me a little to find mine since things have been moved around.
 
Sorry about the delay guys, been very busy lately.

I've read that the box may be at different locations though, Here is mine:
Alarm_knob.JPG


Sorry about the crappy angle, it was the best I could do to show the box clearly, but it is still easy to see it just over the clutch pedal, right?
 
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