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The Legrand smart switch emits a low sound.

The Legrand smart switch emits a low sound.

I don’t think I notice anything until I remove the switch to move to another location. Then I hear a hiss like a noise as soon as it is powered up. Checked the neutral, earthing, load and hot wire connected all solid and see no problem. So I move this switch to another location, but the same. I have another HKRL10 switch and now I notice that it makes noise, but very low. almost hard to hear. Do you think this is over?