ATX MID 4 5.25 2 3.5 4 USB 2.0 HD/AC97 350W V2.2 PRODUCT FEATURES: Best performed SECC Japanese steel metal Rail construction for 5.25" / 3.5" device - for faster installation and service Detachable HDD drive cage - for better install and service Folded edge - for safety installation, no sharp edges, debris Extra vent at rear panel - 12 cm auxiliary cooling fan installed at rear panel for better system cooling Stamped motherboard support - no M/B standoffs installation required, for faster M/B installation Screwless front panel and side panels - for easy removal and installation Configured 9 drive bays - drive bays for expandability of future upgrade 0.8 mm sheet metal construction - for better stability and durability Meet CE, FCC Class B requirement