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USB Power Delivery chargers offering > 18W such as the Anker PowerPort PD Nano 20W Charger can be especially useful for active phone users needing quick charging boosts. The Anker PowerPort PD Nano 20W Charger is similar to other 20W chargers like the Apple 20W USB-C Power Adapter that support USB Power Delivery 3.0 @9 volts output. 

However, in a recent review there's not much difference in charging speed when comparing 20W chargers like the Anker PowerPort PD Nano 20W Charger versus 18W chargers like the Apple 18W PD Charger.

Apart from advertising on Amazon to deliver max 20W to the latest Apple iPhone 12 series like the iPhone 12 Pro Max, the Anker PowerPort PD Nano 20W Charger also claims to be 50% smaller than a typical Apple 18W charger. The Anker charger should also be able to charge other Apple iPhone's like the iPhone 11 Pro Series, iPhone 11, iPhone XS Max, iPhone XS, iPhone X and iPhone 8 or even tablets like Apple's 11-inch iPad Pro (2018) as well as Android phones such as the Samsung Galaxy S10 Series.

Anker unfortunately doesn't include a USB Type-C cable with the Anker PowerPort PD Nano 20W Charger.

The Anker PowerPort PD Nano 20W Charger states to support USB Power Delivery profiles of 15 watts (5 volts @ 3 amps) and 20 watts (9 volts @ 2.22 amps) over its single USB-C output port. You will also get the same power profiles with the Apple 20W USB-C Power Adapter.