My iPhone charger is making a noise?

I got a new charger for my iPhone 4. It's not from apple. It says "IMPUT: AC100-240V-50/60HZ. OUTPUT: DC 5.0V+5% MAX: 2000mA". When I'm around a foot near it I hear it making a noise… Not sure if it's because it's a really good charger or a really bad one.

If your wall charger makes ANY noise, there's a problem. If it does this with any outlet, get it changed right away.

The high frequency gived off inside the transformer.

  • Why is my iPhone making a buzzing noise? Whenever I play music or any sound is made on my iPhone 4s (which I have only had a couple weeks) it sounds like the speakers are sort of buzzing. Like the music isn't clear. It sounds like if you were listening to the radio but it wasn't tuned properly. What could be wrong and how can I fix it?
  • Why is my iPhone 5s home button making a weird noise? I know that its a button and that its supposed to click, and it did in the beginning. My phone is less than 4 months old, and recently when pushing the button it makes a cracking or crunching noise. Even if I just push down lightly, like to use the finger scanner it makes the crunching/cracking noise? I know it didn't make this noise in the beginning? Is this normal? Thanks! Apple always has a 1 year warranty right? So, would my phone still be covered?
  • Why is my IPhone 5c sreen making a clicking noise? Last night I was fiddling around with my phone when I realized that the screen is making a clicking noise. Last night it was just off to the side, but now if seams as if it is spreading to the bottom right corner of the screen.
  • Why does my brand new iPhone charger make noise? It makes an electrical hissing noise. The charger is close to my bed and it woke me up. (It's 2 am where I live.) I haven't dropped it or anything. This has never happened with an iPhone charger before. It's brand new! );