My understanding is that every Prius has a factory alarm which is only activated by the dealer using the Techstream software. It is a basic alarm with just using the door switches to sound if a door is opened, not sure if it has a glass break sensor. Then most every dealer in the US will activate it and add their own alarm box with a shock sensor on it, then sell it is an alarm system for $700 on the sticker of the car. It is really to give dealers more keyless entry control while it is on the lot, but it is sold to you as a feature. One good thing about it is the dealer add-on box allows you to add other sensors, my add-on box was the AL-101 Omega Ultimate. You might need to activate your factory alarm.
