when the batteries in the unit are low an alert tone will be heard and red led will light up once every 15 seconds replace new batteries immediately
当电池电量不足时，系统会发出警报，每隔15秒红色led灯会亮一次，并立即更换新电池
以上为机器翻译结果，长、整句建议使用 人工翻译 。
When the batteries in the unit are low, an alert tone will be heard and red LED will light up once every 15 seconds. Replace new batteries immediately.
当电池在单位内是低的，警报音将听取和红色主导LED一次将打开每15秒。立即替换新的电池。
When the batteries in the unit are low, an alert tone will be heard and red LED will light up once every 15 seconds.
当电池在单位内是低De ~ ~警报音将听取和红色主导LED一次将打开每15秒~ ！
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