An SFP fibre optic transceiver is a device that plugs into an SFP port on your network switch and allows it to communicate via Ethernet over a fibre cable. The type of transceiver you select will vary depending on the distance and fibre cabling infrastructure you require. In addition, many switch vendors require that transceivers are "coded" to enable them to work.FEATURES Supports Multi-Mode Fibre 2x LC connectors 850nm Tx/Rx Wavelength 1.25Gbps SFP data rate 550m cable distance Operating Temparature: 0 - 70°C Pack of 2 WARRANTY2-year limited warranty