Leaving window open and the alarm

[broiler]

I read in the manual that that alarm system has some kind of air pressure sensing system, so that you must keep all of the windows/sunroof closed when activating the alarm or else it will go off. When it's hot I like to crack my windows and/or sunroof. Is this really a problem? Also the manual said that you could press the lock button twice in order inactivate this part of the system. Has anyone played around with this? If you do the double lock what parts of the alarm system are functional?

 

[trm2]

I think in the US at least there is no such alarm system.

 

[davez26]

Volumetric Alarm, not available in the U.S.