Unmanaged 4 Port Industrial 10/100BaseT Ethernet with Fiber 100BaseFX Switch with ST Connector. Secures data transmission by using fiber optic transmission to provide immunity from EMI/RFI interference. *For Multi Mode Use* Comparable to Sixnet, Stride, Hirschmann, and other industrial Ethernet Switches. Supports operating temperatures from 0 ~ +70C (32F ~ 158F).