Naxa NID-7004 - Manual (Page 25)

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In normal use, the power adapter may become warm. You should keep
the environment well ventilated and handle the part gently.
Under any of the circumstance below, you should unplug the adapter.
The power cord or plug is damaged;
The adapter is wetted by water or other sort of liquid, or overly humid;
The shell of the adapter is damaged;
Anytime you think the adapter needs to be repaired;
At times when you want to clean the adapter.