Just replaced my original model with one of the Blue Sea ones yesterday. Also got one installed in the back.
However, the one I put in the front has a low electrical buzzing sound. Has anyone else had this? it works fine so that's good, but the buzzing is loud enough that I could hear it even with my radio on.
I searched the reviews on Amazon and there is only one mention of someone getting a port that was making a buzzing sound.
EDIT UPDATE:
I checked again and it seems the buzz-chirp is only when I have my wireless charging pad plugged in, and nothing on the charger.
Might be it's using just the right voltage/current to cause some audible response from the components in the USB port.
More Update:
I've had this installed for some time now and I don't hear the buzz-chirp at all anymore.