Toyota Prius Alarm
The Gen 3 Toyota Prius comes with a factory immobiliser, keyless entry and push-to-start button. It does not come with an alarm.
I recommend the Cobra AK4615 CAN-BUS alarm which works with the factory remote.
I can also add an Auther Comfort module which will close all the windows automatically upon the car being locked.
Here is a video of the Comfort module in action:
The Prius remote is semi-smart, as in it allows push to start, but does not offer proximity locking.
Some photos of the alarm installed in the Prius: