Patent ID: 7663489

Claim:
A wireless alarm device comprising: a housing configured to couple with an article to be secured; an antenna circuit coupled with the housing and configured to generate a reference signal corresponding to wireless communications with a base communication device of an alarm system; alarm circuitry coupled with the housing and configured to generate a human perceptible alarm; processing circuitry coupled with the antenna circuit and the alarm circuitry and configured to discriminate reference signals resulting from wireless communications of the base communication device from other signals resulting from electromagnetic energy other than the wireless communications of the base communication device, and wherein the processing circuitry is configured to control the alarm circuitry to generate the human perceptible alarm responsive to identification of the reference signals resulting from the wireless communications of the base communication device; and wherein the processing circuitry is configured to detect an absence of spurious electromagnetic energy and to control the alarm circuitry to generate the human perceptible alarm responsive to the detection of the absence.