The attached cable coming off the bottom of the dock plugs into your laptop and that is where it would feed the signal from your laptop to your monitors
So... I'm a bit confused... What are both the HDMI outputs for? Where is the video-in coming from? If there's a video-in that I'm not seeing... Does it duplicate the signal, or what are the 2 HDMI outputs doing?
Baseus has launched the Nomos NU1 Air Spacemate 12-in-1 Docking Station for Windows and macOS. The dock incorporates 12 ports, including two HDMI outputs, two Type-C port, and two SD card slots. The Nomos NU1 Air also brings a nifty power saving feature.