Mobee Technology’s Magic Hub ($50) is a peripheral that mounts on the back of an iMac to give users three extra USB ports. Magic Hub has four USB 3.0 ports — one is used to connect with the iMac itself — and all ports output 2.1A.
The peripheral is directly powered by the iMac or monitor itself, and it’s able to charge devices even when the iMac is turned off.
Magic Hub is installed by first unplugging the iMac’s power cord, then inserting the hub into the hole on the iMac’s neck (as seen in the illustration in the pictures above).
The peripheral is then connected directly to the iMac, with the iMac’s power cord going into Magic Hub itself. It’s a clever solution that takes up very little space.