Pressing this button will also illuminate the display screen for 10 seconds if power unit is in battery operation (screen will always be illuminated in mains operation).
如果使用电池供电，点摁此按钮后，显示屏仅显示10秒钟(在主要操作时，显示屏始终明亮显示的)。
Pressing this button will also illuminate the display screen for 10 seconds if power unit is in battery operation (screen will always be illuminated in mains operation).
如果使用电池供电，点摁此按钮后，显示屏仅显示10秒钟(在主要操作时，显示屏始终明亮显示的)。
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