[cluckkillerb]

Mine does. I was just curious if everyone else's is the same? It's a faint buzzing noise that continues for about 4-5 seconds even after unplugging it from the wall w/o anything charging on it.

If this isn't normal behavior I should probably stop using it, lol.

[Art Vandelay II]

Mine did... don't recall it happening more than once, though.

[Mac58]

Mine did as well.

[futureandroider]

"did" as in it never happened again?

[N4Newbie]

I haven't checked but, as a rule, all such devices (transformers) buzz to one degree or another. I just picked up the power brick attached to my wife's Dell notebook and held it to my ear; the buzz is very distinct at that distance.

[futureandroider]

From all the posts relating to this, everyone seems to also notice it buzzing for a couple seconds even after you unplug it from the wall

[Fraser Carter]

I would probably put it down to the lack of insulation. Wouldn't be too worried about it

Sent from my Nexus 4 using Android Central Forums

[uberness132]

Mine does this too, although only if the USB cable is not plugged into the wall adapter. Odd, but I'm fine with it.