[1000Base LX SFP Transceiver] Data Rate: 1.25Gb/s; Wavelength: 1310-nm; Interface: Dual LC Connectors, with DDM/DOM.; [Easy Installation] Plug and Play, Hot Pluggable SFP MSA 1000Base-LX Compliant, IEEE Std 802.3ab Compliant. It supports OS1, OS2, OS3 single mode fiber, and supports links up to 20km using OS2 SMF Cable.; [1000Base-LX/LH SFP Transceiver] Data Rate: 1.25Gb/s; Wavelength: 1310-nm; Interface: Dual LC Connectors, with DDM/DOM.; [Cabling] It supports OS1, OS2, and OS3 single-mode fiber, and supports links up to 20km using OS2 SMF Cable.; What You Get: 4x 1000Base-LX SFP modules, 2x 1000Base-LX SFP modules, 3-year warranty and technical support.