***** **********Best Quality Guranteed. *****Compatibility- compatible for Cisco GLC-LH-SMD/GLC-LH-SM/SFP-GE-L, please contact us, any product quality and compatibility issues*****Main Specs - 1000Mbps data rate, single-mode, duplex LC connector, 1310nm wavelength, up to 10km transmission distance, DDM Support*****Application - used in fiber switches, routers, NIC, server or other fiber optic equipments with 1G SFP ports*****30 days Free-Returned, 3 years Free Warranty and lifetime technology support*****Packing List - Pack of 10 Gigabit SFP Transceivers