The Comark Fire & Life Safety 4U Rackmount Server is a UL864 certified 4U industrial computer that, compared to the 2U, adds 2 additional optional drives and bays. It also offers a hot swappable option and a RAID option. Connect to a plethora of other devices with 2 serial ports, 9 USB ports, 2 Gigabit Ethernet LAN ports, 10 SATA 3.0 Ports (hardware RAID supported) as well as audio and video ports. It also offers 6 PCIe expansion slots and an optional DVD-RW drive. All Comark servers can be further customized to meet specific industry or technical needs.