Nimble Cargador de pared WALLY SubNano de 20 W​​ 

Sue T, the Nimble WALLY SubNano features Programmable Power Supply (PPS), the most advanced charging technology available today for USB-C devices, SubNano 20 recognizes your device's charging status every few seconds and automatically adjusts to ensure the most effective use of power. https://espanol.verizon.com/products/nimble-wally-subnano-20w-wall-charger/ -Natasha

Whether you use a 20w or 30w charger will make no difference as the phone regulates the charge. A more powerful charger will provide no benefit whatsoever. But it also won't hurt the phone either, so if you already have a 30w charger, use it. -Joe