1. An ambient condition detector comprising: control electronics; at least one ambient condition sensor coupled to the control electronics; at least one audio output transducer coupled to the control electronics; an audio output pitch selector coupled to the control electronics whereby a user can interface with the audio output pitch selector to choose at least one tone pitch from a plurality of distinctly different tone pitches; the control electronics signals the at least one audio output transducer to emit an audible tonal pattern when the ambient condition sensor detects an ambient condition; the audible tonal pattern comprises at least one user-selected tone pitch; and a housing encloses at least the control electronics, the ambient condition sensor, the audio output pitch selector, and the at least one audio output transducer.