Myne is the factory fitted alarm and its a pain in the ass ,it re arms itself when you are near the car,as long as keys arent in the ignition.Ford says its a great safety feature,which helps forgetfull people lol you should see me curse their name when doing late night shopping,its dark and raining and the alarm is going off whilst im rapidly putting the shopping bags in the boot ,priceless To use an Auto electrician or alarm installer might be the way