An electric or battery-operated pencil sharpener works automatically for ease of use. Electric pencil sharpeners plug into a wall outlet and are better for semi-permanent installations.
Since electric pencil sharpeners use a built-in motor, it's important to consider safety. Choose pencil sharpeners with integrated safety features, such as thermal overload protection, auto resetting and tamper-proof designs, to make sure the motor works as it's intended and to keep users safe from harm.
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