The charging head parameters of the iPhone X are as follows:
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Charging power: The maximum fast charging power is 29W.
Charging interface: Support USB PD (Power Delivery) standard.
Charging voltage and current: Support 9V 2A (Apple or QC standard), 15V 1.5A (PD standard).
Common USB-A interface: supports up to 5.2V 2.4A (Apple standard).
Please note that these parameters are the maximum supported parameters for the charging head of the iPhone X, and the actual charging speed may be limited by the power adapter and charging cable. It is recommended to use the original Apple charger and charging cable to ensure the best charging effect and security.