Review on 🔌 SABRENT iMac Multi-Port Hub with Convenient Front Access USB Ports, SD/Micro SD Card Reader, 3.5mm Headphone Jack, and HDMI 2.0 Output (Compatible with iMac 2017 to 2020) - HB-SIMC by Loren Slama

So far so good (IOW: works out of the box). It fits very snugly on a 27-inch iMac Retina 5K (obviously pre-USB-C model), and you can only use one on an iMac. Small protrusions on the main body of the hub fit into a vent that runs along the bottom edge. Insert these protrusions into this air vent, and then connect the hub's own connector to your iMac. This is useful for USB peripherals that don't always need to be plugged into a computer. - SD media or when connecting the camera to a computer, Wacom Intuous 5 tablet, Xrite i1 Display Pro colorimeter or portable hard drive/SSD. REVIEW WITH CHANGES: On 05/14/2017 I strongly recommend you to buy a Sabrent 5V 4A 100V-240V to DC Power Adapter. Maybe any 5V 4A adapter will do if you have the right to plug it in. since Sabrent doesn't mention it in their description or in the instructions that came with it, I'm deducting a star from my rating.