Dell DF5F0 is a 180 W AC adapter for powering compatible Dell laptops. It converts mains power for a laptop that calls for this adapter specification, with the DF5F0 model number identifying the version.
The listed output is 19.5 V. A three-contact plug and 7.4 mm connector distinguish its connection details; check that the Dell system calls for them. The listing specifies a C6 power cord, while the Australian package listing describes a 2 m cord.
The 180 W rating and 19.5 V output describe the power supplied, while the plug and connector help match the adapter to the laptop. Use it as a laptop power source only where the Dell system specifies these characteristics.