A vehicle alarm system sounder device is provided, comprising a first transducer element 1 and a first sound generating surface 11. The first transducer element 1 is arranged in connection with the first sound generating surface 11 to thereby generate an a...

To detect removal of a battery and enhance accuracy of theft detection for a vehicle, a theft detection device uses a voltage monitoring unit for monitoring a voltage of the battery to calculate a drop amount of the voltage in a predetermined time interval...

An apparatus which does not set off an alarm is provided after a battery is removed by switching operational modes. The apparatus includes an internal power supply (66) which is capable of supplying power to an acceleration sensor (30), and a CPU (50) when...

A vehicle burglar alarm circuit includes a transformer having first to fourth taps, a center tap provided at a center point and output taps, wherein the number of coil turns between the first and second taps is greater than the number of coil turns between...

A burglar alarm using power cord to transmit signals includes a main unit provided with a power supply voltage regulator circuit, a CPU circuit, an FET driving circuit, and an RLC oscillation circuit to convert digital code signals into analog signals, whi...

A wireless siren anti-theft device mainly includes a host having a power-supply voltage-stabilizing circuit, an anti-theft coding and CPU circuit, a host control circuit, an emitting circuit, a host receiving circuit, and an I/0 socket; and a wireless sire...

In a communication and interface system between the antitheft controller (1) for motor vehicles and the acoustic alarm signaller (4), wires that are usually installed on motor vehicles to connect Other uses, particularly the one (5) connecting the acoustic...