Cannot get UGEE 2150 Tablet screen to mirror MacBook Pro screen

Just got a brand new UGEE 2150 Visual tablet and cannot get it to completely work. The components include the monitor, the HDMI cable, the USB cable, and the pen. The MacBook can detect that there is a second visual component hooked up to it, and if I use the pen on the UGEE Tablet monitor screen it reads/moves the mouse/has pressure sensitivity, but I cannot get the UGEE Tablet monitor screen to display anything. All of the drivers have been installed, uninstalled and reinstalled again, I've tried resetting the computer, and I've tried resetting the tablet monitor. Anyone have any experience using or setting up this equipment? Any help would be greatly appreciated.