If your smoke detector is working properly, the red light should be on.
如果你的烟雾探测器运作正常，红灯应当亮起。
Do the following to ensure the safe operation of your smoke detector: if your smoke detector is working properly, the red light should be on.
为确保您的烟雾探测器的安全运行，请执行以下操作：如果烟雾探测器正常工作，则红灯常亮。
Function of under and upper thread auto detector, red light displayed on the thread broken position.
底面线自动检测功能，断线位置亮红灯显示。
Function of under and upper thread auto detector, red light displayed on the thread broken position.
底面线自动检测功能，断线位置亮红灯显示。
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