When installing the battery, please pay attention to the position of negative and negative pole.

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1.When installing the battery, please pay attention to the position of negative and negative pole.
2.When using the pen , please avoid shocking and heavy falling, so as to damage the bulb.
3.When the battery is short of voltage , please replace it in time , to avoid corrosion.
4. Please put it in a dry and cool place , to avoid the sun and rain.

Item Code:-DI023