buzzing X10 wall light switch

[dood]

I have installed a LW 10U X10 wall switch to turn on / off and dim my room lights. It's working well manually and via my pronto but I've noticed that when the lights are turned on, the switch buzzes. This is noticeable when walking past it. Is this normal?

[Docta teef]

Yes its normal and not just limited to x10 switches all dimmers buzz a bit. That is unless its buzzing very loudly im assuming your putting your ear quite close to it