Features: 1.Self Adaptive RJ45 Ports: This SFP fiber switch provides multiple SFP optical ports and 10/100M adaptive RJ45 network ports. 2.Lossless Transmission: This Ethernet optical switch supports lossless and efficient transmission of multiple protocols. Full/half duplex self adaptive. Support IEEE802.3x flow control, back pressure flow control. 3.LED Indicator: This Ethernet fast switch is designed with LED indicator to check the status of TX, FX LINK/ACT, POWER, FDX easily. Complies with IEEE 802.3i IEEE 802.3u IEEE 802.3ab IEEE 802.3z 4.Plug and Play: This Ethernet switch is plug and play, support auto flip of MDI/MDI X ports, support jumbo frame size 9K bytes, support the operating temperature range from 0 to 60. 5.120km Extension: This SFP Ethernet switch can extend the fiber distance from 0 to 120km when used with different types of SFP module. Support media access control address self learning and QoS, ensuring efficient network operation. specification:Item Type: SFP Fiber Switch Material: Metal Supported Protocols: IEEE 802.3i IEEE 802.3u IEEE 802.3ab IEEE 802.3z SFP Ports: 4 RJ45 Ports: 4 Data Rate: 100Mbps for SFP, 10/100Mbps for RJ45 PackageList:1 x SFP Fiber Switch 1 x Power Adapter 1 x User Manual