This iPad Pro 3 charger supplies 5V and 9V. Are both voltages required to charge the iPad? The product page just says USB-C, no voltage given.

18W USB-C Power Adapter

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    Yes. The default start up voltage will be 5v to allow for backwards compatibility. If USB Power Delivery is negotiated between the charger and device, 9V may be switched to in order to provide faster charging rates.

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