At the bottom of the hub, there are three vents from which the excess heat gets released. There is also a built-in cooling pad to keep the USB Hub cool. Now, coming to the port’s front, the DGRule Invisible HUB features one USB-C input port, one Thunderbolt 3 port, three USB 3.1 Gen-1 ports, a mini display port, an SD card slot, and even a micro-SD slot and of course, the beloved headphone jack. And as the USB hubs also match the space gray and silver color of the MacBook devices, the port-station truly lives up to its name. So, unlike those USB hubs that connect with a single connector and sits beside your laptop taking up an ample amount of space, the DGRule USB Hub seamlessly integrates with a MacBook putting all the ports at the back of the device.