This chassis belongs to the "Small Form Factor" Line and it's targeted at the Mini-ITX industry. Apart from being the typical mini-case with 220 watts PSU included, what makes this product special against other Mini ITX cases? It supports full 5.25" optical drives and two 3.5" full sized HDDs. Compared to many other Mini-ITX cases; this can be an advantage over other products making your new purchase a lot cheaper. It also supports a full-height PCI card, which means you can install your Audio or Video card and enhance your HTPC experience.