Only Apple authorized chargers can support 7.5w charging. (The two sold on the official website are 500 yuan)
Other chargers have 5w power
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As long as the charger with the Qi logo can be used, the phone will judge the current.
So there is no difference in the actual experience between a $10 wireless charging board and a $100 one.
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Just buy one that looks good on you.
I like the magic disk4 and the Samsung Ep-pg950