| 摘要 |
<p>A security device comprising a remote unit and a base unit wherein; the remote unit comprises: a manually activated switch, a speaker, a microphone and communications means to communicate with the base unit; and the base unit comprises: communication means to communicate with the remote unit and means to dial one or more telephone numbers; characterised in that activation of the switch activates the dialling of one or more telephones by the base unit, such that communication is enabled between the remote unit and a dialled telephone.</p> |
