Abstract: A combination smoke, carbon monoxide and hydrocarbon detector including a smoke detection mechanism adapted to transmit a smoke signal upon the detection of smoke, a carbon monoxide detection mechanism adapted to transmit a carbon monoxide signal upon the detection of carbon monoxide, and a hydrocarbon detection mechanism adapted to transmit a hydrocarbon signal upon the detection of hydrocarbon. Next provided is an audio alarm mechanism situated within the housing and connected to the each detection mechanism. The audio alarm mechanism is adapted to emit a high intensity audio alarm upon the receipt of a signal, whereby the type of audio alarm is unique to the signal received. Further provided is control circuitry having a first mode of operation when only one signal is received from the detection mechanism whereby the control circuitry continuously transmits the one signal to the audio alarm means upon the receipt thereof.