Works fine, but it makes a terrible high-pitched noise when charging.

This seems to charge fine, and mine doesn't make any noises as others are complaining about, but it has an extremely bright white LED on it for no reason

Really wish it didn't make faint hissing noise when plugged in

With it plugged into the outlet there's a pronounced humming noise on the radio, when it's plugged out the noise ceases

It makes a humming noise, not for me.

I've bought a few more of these, because they're okay, but it turns out that some of the units make a disconcerting loud buzzing/sizzling noise, so cannot be left charging unattended

Makes a whining noise when connected to both my iPhone and iWatch.

I had to ship one back due to the strange buzzing noise comping from it when plugged into the wall outlet without any device or cable attached

Charges fine but a very annoying buzzing noise emits from the unit

It would make a hissing noise with the light on and while the phone is plugged in, but that also meant that the phone was getting its charge

I received my item in a timely fashion but when I plug things into it the charger doesn't charge and makes an audible clicking noise.

No high pitch static noise

It's making a funny buzzing noise when I plug my echo dot and little Bluetooth speaker into it

This morning, while charging a single iPhone7 it made a hissing noise, started smoking and melting.

Does what it's supposed to, but generates a soft high pitch noise that can get annoying.

brilliant!I’ve not had any failures similar to what others have described