Please try the troubleshooting by following the below steps one by one:

• Let the charger sit for 5 minutes (without plugging it into the power outlet or plugging anything else into the charger). 

• Reconnect the power cord of the charger.

• Replace the charging cables of the devices or try other devices for charging. 

• Reset the charger to factory settings.

Note: due to proprietary charging protocols, some models of Surface and Dell laptops cannot be charged at full speed and will display a slow charging prompt. These devices include, but are not limited to:

• Surface Laptop Studio 2

• Dell XPS 15 (9500 / 9510 / 9520)

• Dell Alienware X14

• Dell Mobile Precision 5570 

• Dell XPS 13 (9305 / 9310 / 9315)

• Dell Inspiron 16 Plus (7620)

• Dell Latitude (3520 / 5520 / 7420)

• Dell Vostro 13 5320