When GSM Car Alarm System installed in your car, it can be controlled by your mobile phone or any phone by the normal conventional ways (using the remote controller) of controlling your Car. If someone enter into your car, the alarm will call your phone. When you receive the message, you can speak and warn the people in your car through your mobile anywhere via the speaker of the alarm, you can cut the power/ petroleum through your mobile so that people can not drive the car. You can also monitor everything in the car through your mobile anywhere (what people talking). You can close the car door/window through your mobile anywhere