Dell WD19DC User Manual page 14

2. Connect the AC adapter to a power outlet. Then, connect the AC adapter to the 7.4 mm DC-in power input on the Dell Performance
Docking Station WD19DC .
Figure 6. Connecting the AC Adapter
3. Connect the USB Type-C connector to the computer.
Update the Dell Performance Docking Station WD19DC firmware from www.dell.com/support/drivers.
14 Quick Setup of Hardware