diane Yes it has an alarm. A very loud and shrill alarm! It's armed when you lock the car. If you look in at the "Towing" switch you will notice a red light blinking. That tells you the alarm is active. I know it works on the door and if the car is jacked up. To turn it off just put your key in the ignition and turn it on. The alarm will quit. If you want to test it.... Roll a window down. Then lock the car. Reach in the open window and open the door. BTW you may want to wear ear plugs :lol: . Then put the key in and turn it off.