Alarm systems - Intrusion detection - Events controller-recorder function integrated in central alarm units or telephone alarm transmitters.
报警系统。侵入检测。事件控制器。与中央报警装置或电话报警送话器相结合的记录功能。
2
Or you may use long-distance communication lines, telephone lines, close units in the external data information.
或者你可能使用远程通讯线、电话线、接近位于外部数据单元的信息。
3
Household telephone Subscribers refer to telephone sets installed in resident dwellings, including those with telephone charges paid by individuals, by public units and free of charge.