Patent ID: 7956764

Claim:
An ambient condition detector comprising: an ambient condition sensor to sense a presence of at least one ambient condition; the ambient condition sensor comprises at least one of a smoke sensor, a fire sensor, a thermal sensor, a gas sensor, a motion sensor, or a radiation sensor; control electronics emit a first audible tone group through a first audio transducer and a second audible tone group through a second audio transducer when the ambient condition sensor senses the presence of the at least one ambient condition; the first audible tone group comprises a first pitch tone and the second audible tone group comprises a second pitch tone whereby the first pitch tone and the second pitch tone comprise distinctly different pitches; and a time interval between emission of the first audible tone group and emission of the second audible tone group whereby during the time interval, no audible tone is emitted by either the first or second audio output transducer.