| 摘要 |
<p>The present invention is an alarm system comprising an alarm handset (10) having a housing (30), a detector circuit (100) having means (102, 104) for receiving a preselected signal from a remote transmitter (40) and generating a first detection signal in response thereto, first sensing means for sensing change in a preselected parameter of the handset, warning means (300) for generating a warning signal, alarm means (400) for generating an alarm signal and control means (500) responsive to receipt of the detection signal to activate the alarm means (400). The control means (500) is operable to activate the warning means in response to at least one of receipt of the control signal and sensing of the change in the preselected parameter of the handset.</p> |
