[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.; 1.25Gb/s, 1000Base-LX/LH SFP, 1310-nm, Dual LC Connectors, reach up to 20km transmission over single-mode fiber.; Plug and Play, Hot Pluggable SFP MSA Compliant, IEEE Std 802.3ab Compliant, supports DDM/DOM.; What You Get: 2x 1000Base-LX SFP modules, 1x 1.25G SFP transceiver, 3-year warranty and technical support.