Mi Mi 20 watt wireless charger is generally not fit for the charging head, you need your own mobile phone line charging head can be used, if you want to buy another charging head, you need to buy another separately, this is not in their package range. In addition, they want to make money for this, and different accessories cost different prices.
20w original is good, of course, you can also use a larger wattage, will not damage the charger and mobile phone