| 摘要 |
<p>The present invention allows identification to a wireless security and alerting system which comprises a transmitter circuit and a receiver circuit. Each transmitter (10) is provided with at least two buttons. A visitor uses a main push button (5). At least one discreet button (3) is used discreetly by a member, such that the receiver will chime differently, thus allowing the residents within the hearing range to distinguish between a visitor from a member. The invention also includes a low battery warning arrangement. <??>The present invention allows a plurality of locations in a building to be equipped with such transmitters (10), which are connected to at least one receiver. An application-specific integrated circuit (ASIC) or the like device is employed in a transmitter circuit, and a microprocessor (U1) or the like device in a receiver circuit. <IMAGE></p> |
