"The Ultra Stackables offer a number of different models to choose from. There's a 7 port USB2 hub, card reader + 6 port USB2 hub and three 3.5" HDD enclosures. The HDD enclosures are available in USB2, SATA, and Firewire models. As the name suggests, they are all stackable, but also can be used individually and positioned horizontally or vertically. They even have a180-Watt Multi-Outlet Power Center to power all the stackable units. Watch the video to find out more and check out the bloopers at the end." ~3dGameMan.com