The maximum output in watts per port.
The higher the wattage, the faster the connected device is charged.

If the power supply does not provide enough wattage, the device may not work correctly or may not work at all. The device may work slower than normal and the battery may not be able to charge.

Below is a general overview of typical wattage requirements for different types of devices.
However, exact wattage requirements may vary from one device to another.

Smartphones 
Most smartphones require a charger with 5 to 20 watts to charge, depending on the specific model.

Tablets
Most tablets need a charger with an output of 10 to 20 watts to charge, depending on the specific model.

Chromebooks
Most Chromebooks need a charger with an output of 45 watts to charge, but some models may require higher or lower output.

Laptops
Laptops usually need a charger with an output of 45 to 90 watts to charge, depending on the specific model. However, some high-end gaming laptops require a charger with a power rating of more than 100 watts.