Should I be worried that my charger makes high pitched noises?

So I have an IPhone 5c and I recently bought an off brand charger and I made a discovery. When the battery gets near charged and is not being used, the charger emits a high pitched hiss until I either unplug the device, or start to use it. Is this something I should be worried about, meaning could it catch fire or something?

I don't think its bad for your phone so id just keep using it but in the mean time id get another charger its probably going to break soon, or the ringing will drive you insane. I'm not a tech genius but i don't think it will catch on fire

There are transformers and capacitors and loads of other gizmo stuff in the charger. Transformers make a hissing sound which is normal. The originals have a high quality case and produced in a way to suppress the hissing sound. So its normal. Just avoid the charger being plugged in all day. These chargers tend to consume more energy comparatively. Otherwise it's fine!

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