I believe it's 10w, it says "fast wireless charging" on the screen when it's on the charger.

Edit; actually it may be 15w, im really not sure. Is there a way I can check through an app or something?

It seems the white version supourte 15w maybe? https://www.amazon.com/dp/B07THTPJFS/ref=cm_sw_r_cp_apa_glc_fabc_YZ6TFHFVJEZ59G8XRF8Y?_encoding=UTF8&psc=1

I'll test mine out tonight