Abstract: A detector apparatus is disclosed for emitting a warning alarm signal in response to the presence of a hazardous condition within at least one room of a building having a plurality of rooms. The apparatus includes a plurality of hazardous condition detectors arranged such that at least one detector is disposed within each of the rooms. Each of the detectors includes a detecting device for detecting the presence of the hazardous condition and a micro controller electrically connected to the detecting device and powered by an electrical power source. An alarm is electrically connected to the controller such that when the detecting device detects the presence of the hazardous condition, the controller emits an electrical signal. An analog to digital converter device is electrically connected to the controller for converting the electrical signal into a digital signal so that when the hazardous condition is detected, the converter transmits the digital signal.