Auto theft is a common occurrence; alarms and ignition kill switches have been developed, but have not proved adequate against organized car theft. Brazen hold-ups of drivers is an increasingly common form of car stealing. In such circumstances, key-dependent devices are of little use. Such devices are also expensive to very expensive depending on sophistication.
There exists accordingly a need for car theft deterrent devices which are effective in the absence of the owner, and despite the thief having the car ignition key. Car tracking systems are being offered but are too costly except for the most expensive of automobiles. But, the great bulk of cars stolen are of only moderate cost, making tracking devices too expensive for use.