If it is a mobile phone charger, in order to be safe, it is recommended to buy a 2-amp charging head, that is, a charger with a rated power of 10 watts.
Now the standard wireless charging power supply is 10W, specifically 5V2A. Apple's wireless charging power is the same. Some of the relatively low power is 5V1.5A, specifically 7.5W. Now the mobile phone wired charging power is about 18W, relatively speaking, wireless charging is still much slower than wired charging.