The door will lock automatically when the car is driven and the brake is trodden slightly. And the door will unlock automatically when the engine is shut down. Also, you may unlock the door by remote controller when driving. Good Adaptability: Applicable to most motor vehicles Monitoring: You may listen in and even communicate with the thief when the car is being stolen.( the phone can be used for usual phone) Forced Shut-off: The engine can be shut off by mobile phone or telephone when the car is being stolen. Automatic Defense: If you forget to lock up the car, the mainframe will lock it up automatically after 1 minute. multi-languages voice: Chinese, English, Russian, Arabic and Farsi. GPS Automatic Locating: You may know your car position, direction, speed and even draw a driving slot in the E-map of the computer by installing a terminal receiver. GPS Multi-position: You may monitor more than one car by using an at tempering software.