Is it bad to use a knock-off iPhone 5 charger?

I recently bought what I thought was a genuine Apple iPhone 5 charger, but it turned out to be a cheap knock off. It does charge my iPhone, but the screen says it does not support this accessory. Will it harm my iPhone in any way if I continue to use it?

I think you are fine as long as its not from china

Not at all, if there's anything to break, it would be the charger itself.

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