I'm pretty sure that that's a USB-C port at 0:21. Unless it's only for charging, I imagine that it can at least be used in wired mode (unless you specifically want a wired-only device).

checks Kensington site

Yeah, sounds like it can be used in wired mode.

https://www.kensington.com/p/products/electronic-control-solutions/trackball-products/expert-mouse-tb800-eq-multi-connection-trackball/#Product-specs

Includes USB-C® cable for in-use charging and wired connection.

EDIT: On the same page:

Connectivity: 2.4GHz USB Receiver, Bluetooth®, Wired USB-C®, Wireless