Patent ID: 7817018

Claim:
A car antitheft system comprising a main controller and an antitheft state indicator; the main controller being invisibly mounted on a car, and the antitheft state indicator being embedded in an engine start button of the car and electrically connected to the main controller for indicating a current antitheft state of the car; whereby the engine start button serves to start the car engine when the car antitheft system is released, and to indicate the current antitheft state of the car when the car antitheft system is enabled and the antitheft state indicator embedded in the engine start button is lighted, so as to warn and stop a thief from invading the car; wherein the main controller is internally provided with a CPU and related circuit electrically connected to an ignition switch of the car and the engine start button, whereby when a user inserts a correct car key into the ignition switch and turns the ignition switch to ON, and then pushes the engine start button a predetermined procedure and preset number of times, the car antitheft system can be released in an emergency.