StarTech.com Dell EMC QSFP-40G-LR4 Compatible QSFP+ Module, 40GBASE-LR4, 40GbE Single Mode (SMF) Fiber SMF Optic Transceiver, 40GE Gigabit Ethernet QSFP+, LC Connector, 10km, 1311nm, DDM - Lifetime Warranty (QSFP40GLR4ES) - QSFP+ transceivermodul - 40GbE