| 摘要 |
<p>There is provided a security system for an electrical device connected to a mains electricity supply, the security system comprising a confirmation transmitter interposed between the electrical device and the mains electricity supply. The transmitter is arranged to send a confirmation message via the mains supply to a control unit that is operatively connected to the mains supply. The control unit is arranged to activate an alarm if the control unit does not receive the confirmation message.</p> |
