what is the maximum Watt charger u can use for iPhone 12 pro
can I use more than 20W charger for iPhone 12
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Yes -- see the following from Charge your iPhone with an iPad or Mac notebook power adapter - Apple Support
You can use Apple USB power adapters for iPad and Mac notebooks to charge iPhone, iPod, Apple Watch, AirPods, and other Apple products.
and the following from Fast charge your iPhone - Apple Support
Fast charging works when you use an Apple USB-C to Lightning cable and one of these adapters:
- Apple 18W, 20W,2 29W, 30W, 61W, 87W, or 96W USB-C Power Adapter
- A comparable third-party USB-C power adapter that supports USB Power Delivery (USB-PD)