USB 3.0 HUB, Cateck Premium 4-Port USB 3.0 Hub with 2-Foot USB 3.0 Cable Exclusively Designed for iMac Slim Unibody Exclusively designed for the iMac Slim Unibody model released November 2012 or later. (21 inch / 27 inch / 5K) No more banding yourself to strange angle just for plugging a USB device onto your iMac Brings four more USB ports to the front side Built-in surge protector safeguards your devices Easy to set up, Plug & Play, Hot swappable