Yes, the 05 Civic Hybrids already come with an alarm. The salesman verified this when I bought mine. There are 2 modes to the alarm. If you buy the alarm option for $185 (or whatever the price is now) the car absolutely will not start unless your key is in the ignition. This means if someone breaks into your car they will not be able to hotwire it. The second mode of the alarm is if you DON'T buy the $185 option. It's still an ignition-kill type alarm but does have one weak spot. The only difference is a burglar WILL be able to hotwire your car as long as they don't open a door to get in. In other words, if they break a window and open the door, they WON'T be able to hotwire the car. But if they break a window and CLIMB thru the window, hence not opening the door, it will be possible for your car to be hotwired and started. For the record I didn't buy the $185 option. I got a break on my car insurance as well. So by default you do have a fairly decent alarm system on the car already at no extra cost.