What safety precautions should I take when using this printer?

Always use a grounded electrical outlet, do not touch socket contacts, unplug the product before cleaning, do not install near water, place the printer on a stable surface, and ensure the power cord is protected where no one can trip over it. Read and understand all instructions to avoid electrical shock hazards.

From the official HP LaserJet Pro M404 M405 Printer manual, page 2

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