Will fast charging an Iphone X still work If I am using a dual lightning adapter for charging and headphones, or will it only charge at 12 watts?

Will fast charging an Iphone X still work If I am using a dual lightning adapter for charging and headphones, or will it only charge at 2 watts? I want to know if i can use an existing adapter, or if I will need to use a bluetooth adapter of some kind.

29W USB‑C Power Adapter

29W USB‑C Power Adapter

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