3U Rack Mountable Server Chassis/19" with 500W EPS12V Power Supply; Drive Bays: (2) 5.25" & (1) 3.5" External, (1) Slim CD-ROM/DVD-ROM bay, (5) 3.5" Internal bays; Indicator LEDs for Power Status, HDD/LAN; Front Control Panel: Power ON/OFF, System Reset, (2) USB 2.0 ports; Security: Intrusion Switch; Cooling Fans: (1) 80x25mm front fan, (2)Optional 60x25mm rear fans; (7) Expansion slots.