Multifunctional bidirectional communication system for car

A bidirectional communication system with multiple functions for automobile is characterized by that a hidden mobile telephone is connected with an antitheft alarm system, a tweeter and an inducer, said mobile telephone is cooperated with the antitheft alarm by the GSM communication protocol, and another mobile telephone is carried by the driver of the automobile. After the inducer in the front of automobile is pressed, the relative message is sent from the hidden mobile telephone to another one and the driver can process the message via tweeter. As a result, the antitheft alarm message can be sent out and the condition in automobile can be monitored.