Quote Originally Posted by sina518 View Post
your only solution is to just get rid of the siren because however you hook it up it will chirp once for lock and twice for unlock, like it has been stated it is to distinguish the difference. if you dont like the tone you can run it off your factory horns and it will make whatever noise your horn makes.

Sina, That isn't quite true, depending on the model of the alarm some dei alarms have a programmable feature where you can delete the arm and disarm chirps and the sirens are then only activated when the alarm itself is triggered.