I don't think it has one...which in my opinion is good. They only make noise and don't prevent theft.
I only agree with some lower end alarms. With higher end ones it's extremely difficult to circumvent them. With higher end alarms you can outfit enough addon modules that make the car extremely difficult to steal. Sure, anyone can still break a window and steal your iPod, sunglasses, and other contents that aren't in your trunk, but they won't be able to steal your car.
As an example, I could be in a shopping mall, buried 1000 feet in, and if you touched my car, I'd know.
Not trying to argue. Just stating that for some money, you can get a good alarm.
My best advice though would be to pay cash, as most alarms are easily defeatable by he person who installed them, and credit cards can lead to addresses where car is parked.