| 摘要 |
A security system for a car comprises a control unit for installation in the car and a portable unit to be carried by the driver. The portable unit, on recognising a uniquely coded first signal transmitted by the control unit, transmits a uniquely coded second signal to the control unit which, on recognising it, cancels disablement of the car ignition, petrol pump etc. Transmission of the first signal is produced on the driver inserting the car key in the driver's door lock. An alternative form of security system comprise a portable unit which transmits a uniquely coded signal to a control unit in the car, the control unit on recognising the transmitted coded signal enabling use of the car. <IMAGE>
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