Abstract: The present invention relates to a vehicle warning system device that is capable of detecting sirens of approaching emergency vehicles. This device includes a plurality of siren detectors, each siren detector capable of generating status signal at an output of each siren detector when activated by a siren. A plurality of visual indicators and a speaker. A microprocessor having a microprocessor plurality of input, a microprocessor plurality of output and a microprocessor memory, the microprocessor plurality of input connected to each output of the plurality of siren detectors, the microprocessor plurality of output connected both to the speaker and an input of each of the plurality of visual indicators.

Abstract: A ground fault detection scheme uniquely incorporated within a distributed intelligence, fire alarm and detection system, such that detection is achieved with location identification. The modules (and transponders) of the system collaborate with the loop controller in performing ground fault operations to determine precise existing ground conditions at the module locations.

Abstract: A tire pressure monitor apparatus comprising a vehicle body, four vehicle wheels including tires disposed at four comers of the vehicle body, four position sensors, one mounted between each wheel and the corresponding corner of the vehicle body and a microprocessor controller, wherein the microprocessor controller receives signals from the four relative position sensors and determines, responsive thereto, for each tire, a signal indicative of a pressure of air within the tire.