Dell laptop charger, specifically a 19.5V 2.31A 65W AC adapter. Helpful information includes:
It is compatible with Dell laptops.
The input voltage is 100-240V and the output is 19.5V 2.31A.
It has over-voltage and short circuit protection.
The connector size is typically 4.5mm x 3.0mm.
It can be used to power the laptop and charge the battery.
It's lightweight and suitable for travel.