Going to ask
@Innokin_Ash @Innokin_Joseph and
@Innokin_Mike to make sure I'm right but,
When you say charger, do you mean the
Innokin iTaste Wall to USB - 1000mA
As far as I know they only make the one wall adapter that comes in two version, the US and UK versions.
So I would Guess it's one size fits all kinda thing. They come in the color Black too.
Innokin makes their USB adapters and USB cables to handle 1000mA so if it says itaste or Innokin it should be fine

If it's not Innokin then just make sure it says Output 1000mA on it.
All Adapters are suppose to say input and output on them. But it might be real real small and hard to read.
The US version of Innokn's is between the prongs, you can see it in the pic above. I needed a Magnifier to read it