Included in the box with the hub is one Plugable USB-C to HDMI video adapter.  You can connect this adapter to the hub in order to attach one HDMI display (up to 3840x2160 resolution at a 60Hz refresh rate) to the hub using a HDMI to HDMI video cable (a cable with a HDMI connector on both ends, not included).  

Please note that the amount of displays that can be connected to the hub is ultimately determined by the capabilities of the host PC. 

A PC that has Thunderbolt 4 technology will be capable of driving two displays via the hub.  This is because the Thunderbolt 4 specification requires a single Thunderbolt 4 port to be capable of driving two displays. 

A PC that has Thunderbolt 3 technology will be capable of driving one or two displays via the hub.  This is because manufacturers have a choice when designing a Thunderbolt 3 system in regard to how many displays can be driven via a single Thunderbolt 3 port.  Some Thunderbolt 3 PCs can support two displays, while other Thunderbolt 3 PCs can support only one display. ** Please note that the USB4-HUB3A is officially supported only in conjunction with Windows PCs that have Thunderbolt 4 technology built-in. **

A PC that has USB-C technology will be capable of driving only one display via the hub. 

Please note that not all USB-C systems are capable of providing video output over USB-C. Please consult your PC’s manual or technical specifications in order to determine if your USB-C PC is capable of providing video output.