When triggered by the building's fire alarm controlpanel, it alerts building occupants to the location of the nearest exit using directional sound.
当大厦的火警警报控制面板被触发，该扬声器会使用定向声音引导住户到最近的出口。
2
Using programmer to on-site number input devices, in order to let them display their detailed address and operation status in the controlpanel or fire repeater.