These are the following Apple devices that support 4K60Hz with the new Duo:
- iPad Pro 11-inch
- iPad Pro 12.9-inch (3rd & 4th Generation)
- MacBook Pro (15-inch, 2017 and later)
- iMac (Retina 5K, 27-inch, 2017 and later)
- iMac (Retina 4K, 21.5-inch, 2017 and later)
- iMac Pro (2018)
For Windows devices or devices that use Chrome OS or Linux that would use the extension cord, you would need to check if your computer is DisplayPort 1.4 compatible through the USB-C port.