A small but capable device, the GV-I/O Box 4E provides 4 inputs and 4 relay outputs. It provides both DC and AC output voltages, PoE, TCP / IP and RS-485 port for PC connection. 4 inputs and 4 outputs are provided. The TCP / IP and RS-485 ports are provided for PC connection. DC 12V, 3A / PoE+ (IEEE 802.3at). Up to 9 GV-I/O Box 4(E)/8/16 ports can be linked together. Up to 16 Connections from GeoVision software are allowed to control one GV-I/O Box.