低电量指示。
如使能，当手持终端的电源是低电量时，每10分钟或200次扫描，电源指示LED会闪5 下，蜂 鸣器会鸣叫5 声。
If it is enabled, while the power is low, the power LED on the handheld unit flashes 5 times, and the beeper emits 5 beepers for every 10 minutes or 200 scans.
如使能，当手持终端的电源是低电量时，每10分钟或200次扫描，电源指示LED会闪5 下，蜂 鸣器会鸣叫5 声。
If it is enabled, while the power is low, the power LED on the handheld unit flashes 5 times, and the beeper emits 5 beepers for every 10 minutes or 200 scans.
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