The best solution for a front access and addition to your iMac's rear expansion ports. Exclusively designed for the iMac 2017 and later models. USB 3.1 Type-C upstream connector (connects to the back of the iMac). Front access to 1 x USB 3.1 Type-C port (up to 5 Gb/s data speed @ 5V / 900mA). Front access to 3 x USB 3.1 Type-A ports (up to 5 Gb/s data speed @ 5V / 900mA). Independent SD and microSD UHS-II card readers (up to 300 MB/s). Front access to 3.5mm headphone connector. Rear HDMI 2.0 port for a cleaner look and up to 4K@60Hz output resolution. PLEASE NOTE: All USB ports are backward compatible with USB 2.0 and 1.1. USB Type-C port does not support PowerDelivery for charging devices. M1 iMac NOT SUPPORTED