| 摘要 |
<p>A personal alarm system is provided comprising trigger means enabled to send command and communication signals to a telephony interface unit, receive communication signals from the telephony interface unit, send prompt signals and communication signals to a user, and receive command and communication signals from the user, such that a two-way communication link can be established between the user and a remote aid source. The telephony interface can be provided as part of the marketed system. A call centre is also provided to deal with calls made from the system.</p> |
