Dell 03V9J8 is a 65 W AC adapter for powering Dell laptops. It converts mains power to the DC supply a laptop uses and can replace the same adapter when the part and connector match.
Its rated output is 19.5 V, 3.34 A. The laptop connector is a straight, round plug with a center pin and a listed outer diameter of 4.5 mm. Check these details against the adapter being replaced.
The distributor lists Dell Inspiron 14 (5402), Inspiron 15 (3501), Latitude 15 (5520), and Latitude 14 (3420) among suitable models. This list is limited to the named models; confirm that the part and connector are specified for your laptop before choosing it.
For a home or work setup, the adapter powers a compatible laptop from a mains outlet. Its 03V9J8 designation identifies this particular Dell power adapter for replacement selection.