thats the input current to the charger. Check the output amps. It probably at least 2A. So 10W probably.

If you want a fast charger just for the phone get a quick charge 3.0 brick like this one. This will fast charge.

https://www.amazon.com/Anker-PowerPort-Compatible-Qualcomm-Certified/dp/B077HFFLMS/ref=sr_1_4?keywords=anker+qc+3.0&qid=1568558330&sr=8-4

But if you plan to use it among multiple devices like a phone, laptop, nintendo switch, tablet etc then go ahead and buy the one you originally wanted

Hard to go wrong with Anker, here's a simple little charger that supports quick charge: https://www.amazon.com/Anker-PowerPort-Compatible-Qualcomm-Certified/dp/B077HFFLMS/ for $15.99

And then a 3ft cable - https://www.amazon.com/Anker-Powerline-Premium-Motorola-Smartphones/dp/B019Q3T7YG/ref=sr_1_3?crid=1NZT1JJNA536Q