I believe it's pressing LOCK or turning the car to IG-ON will shut off the alarm. Unlocking it won't. Using the mechanical key and locking the doors should also shut off the alarm.

As for it going off, no idea. Even if someone hit the mirrors, it'll go off. (I did that while washing our old Camry... I hit the back of the mirror with my elbow and a few seconds later, the alarm went off)

Mods: EV mod, VVT-i emblem, sport pedals, OEM cargo mat, JDM Prius interior footwell lighting, Sylvania Silverstars 9003ST, DICE iPod kit, OEM all-weather mats, TomTom ONE v2, LED licence plate lights.