Apple 2011 LED Cinema Display Compatibility

If this is a 27-inch LED Cinema Display (model A1316), you would need a USB-C to Mini DisplayPort adapter. If the monitor has a permanently-attached video cable, you'd want an adapter that brings out a Mini DisplayPort socket; otherwise, you could get a USB-C to Mini DisplayPort adapter cable.

If you wanted to use the USB 2.0 hub ports on the LED Cinema Display, you'd need to run a USB data connection from the monitor to the MacBook Pro (or to a hub/dock you were using with the MacBook Pro). There are a lot of adapters available for plugging USB-A gear (the display) into USB-C devices (the MBP).

You also might need a USB connection if you wanted to adjust the display's brightness using the MBP.

this company seems to understand what they are selling more that most Vendors:

Monoprice Select Series USB-C to Mini DisplayPort & USB-C (F) Dual Port Adapter - 24274 - $7.49

If this is the very similar 27" Apple Thunderbolt Display (model A1407), you need an Apple Thunderbolt 3-to-2 adapter.

My understanding is that the Thunderbolt Display has both a permanently-attached cable and a daisy-chaining port. The attached cable sometimes goes bad. You can try it first – but if it doesn't work, you may want to try getting a Thunderbolt 1/2 cable, and running it from the adapter to the monitor's daisy-chaining port, instead of giving up on the display.

the Apple cinema display LED from 2011 features lead-in cord with three connectors:

It includes three USB 2.0 ports and a convenient single cable with three connectors (Mini DisplayPort, MagSafe, and USB 2.0), a built-in iSight camera with a mic and a 2.1 speaker system.

from:

https://everymac.com/monitors/apple/studio_cinema/specs/apple-led-cinema-display-27-inch-specs.html

The Apple Thunderbolt Display 27-in looks identical, but has a lead in cord with ONLY TWO connectors:

In addition to the built-in Thunderbolt cable, the display also has a built-in MagSafe connector that charges a Thunderbolt-equipped MacBook Air or MacBook Pro.

from:

https://everymac.com/monitors/apple/thunderbolt/specs/apple-thunderbolt-display-27-inch-specs.html