Dell XPS 18 (1820, Early 2014) - Manual (Page 29)

Powered Stand │ 29
Using the Powered Stand
Connecting the Power Adapter to the Stand
CAUTION: Use only the supplied power adapter and power
cable. Using unauthorized adapters or cables may severely
damage your computer and stand.
1 Connect the power adapter to the power-adapter port on
the stand.
2 Connect the power adapter to an electrical outlet.