Startech Cisco QSFP-40GE-LR4 Compatible QSFP+ Module, 40GBASE-LR4, 40GbE Single Mode (SMF) Fiber SMF Optic Transceiver, 40GE Gigabit Ethernet QSFP+ LC 10km, 1270nm to 1330nm, DDM - Lifetime Warranty (QSFP-40GE-LR4-ST) - QSFP+ transceivermodul - 40GbE