***** **********Best Quality Guranteed. *****100% Compatiblefor Cisco Gigabit Ethernet 1000BASE-SX standards (coding as Cisco GLC-SX-MMD, also for Cisco GLC-SX-MM SFP-GE-S, GLC-SX-MM-RGD *****Wide compatible Also Compatible for Open Sources brand, including Ubiquiti UF-MM-, Netgear AGM731F, Brocade E1MG-SX-OM, Unifi, Finisar, Mikrotik, Trendnet, TP-link and Dlink DEM-31T, Zyxel, Trendnet *****SFP SX1000BASE-SX 1.25G bps SFP Mini-GBIC, multi-mode, 850nm, 550m, duplex LC Hot plug, support DOM, MSA compliant*****3 WARRANTY30-Days Free-returned, 60-Days Free-replacement, 3-Years Free-maintenance*****Application Specially for Gigabit Ethernet and Fiber Channel, Switches, Routers, Wireless LAN controllers and other optical links with 1.25G SFP port.