ISV-101w does noises when plugged in

Bought a new ISV-101w sous vide stick and it does high pitch noises when plugged in, even if i not cook with it, is that normal?
Its a electrical buzzing sound.

The ISV-101W has an internal fan that continues to operate even when the heating is off. The top of the ISV-101W is not waterproof; it is designed to prevent water vapor from entering and causing condensation. It will make a little sound when working.
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