Review on 💻 High Quality USB-C Thunderbolt 3 to Mini DisplayPort Adapter: USBCele USB Type C to Mini Display Port 4K Cable – MacBook Pro, iMac, LED Cinema Display Compatible by Jason Spainhour

Doesn't recognize the "Increase Brightness" command in the OS control panel, but the 3rd party brightness slider menu works reasonably (increases the brightness of my Tbolt screen to full potential). It's a lot dimmer than my new Apple TBolt display, and I haven't compared it to a direct connection to an old laptop to see if it's display related or this connector related. I used expert calibration to add some contrast. Strangely works when using the calibration tool. But I am very happy that I can use my old AppleLED as a second display!