在门上安装一个特定模块或者红外感应器，不仅将触发监控设备，还将开启大厅的大灯同时播放预先录制好的欢迎问候语。
Certain modules have a door or IR sensor that not only disarms the surveillance module, but also switches on the hallway lights and even play a prerecorded welcome greetings.
在门上安装一个特定模块或者红外感应器，不仅将触发监控设备，还将开启大厅的大灯同时播放预先录制好的欢迎问候语。
Certain modules have a door or IR sensor that not only disarms the surveillance module, but also switches on the hallway lights and even play a prerecorded welcome greetings.
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