StarTech.com Dell EMC SFP-10G-ER Compatible SFP+ Module, 10GBASE-ER, 10GbE Single Mode (SMF) Fiber SMF Optic Transceiver, 10GE Gigabit Ethernet SFP+, LC Connector, 40km, 1550nm, DDM, SFP+ - Lifetime Warranty (SFP10GEREMST) - SFP+ transceivermodul - 10GbE