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Huawei WS331B Manual page 12

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Do not drop or cause an impact to the power adapter. If it is damaged, take it to an
authorized service center for inspection.
If the power cable is damaged (for example, the cord is exposed or broken), or the plug
loosens, stop using it at once. Continued use may lead to electric shocks, short circuits, or
fire.
Do not touch the device or the power adapter with wet hands. Doing so may lead to short
circuits, malfunctions, or electric shocks.
If your power adapter has been exposed to water, other liquids, or excessive moisture, take it
to an authorized service center for inspection.
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