If the charger is genuine and the charging voltage and current are the same as the original or Apple's official recommended values, there is basically no impact.
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Because the wireless charging of Apple iphone x is based on the Qi standard, in theory, as long as the third-party wireless charger that meets the Qi standard can support wireless charging of iphone x mobile phones.
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Qi uses the most mainstream electromagnetic induction technology. Qi standard has two characteristics: convenience and versatility. Different brands of products, as long as there is a Qi logo, can be charged with Qi wireless charger.