The nPC20 PC is approved for Class I, Div. 2 areas with choices of Intel fanless Atom Dual Core E3826 1.46-GHz CPU or Quad Core E3845 1.91-GHz CPU, 2-8 GB DRAM, and 80-300 GB solid-state storage. Dual video output via HDMI and VGA, 24-Vdc power (AC optional), Windows 7 Professional (32-bit) or Ultimate (64-bit) OS. Dual Gigabit Ethernet ports, two USB 3.0 ports, one Audio Line Out port and one RS-232/422/485 port.