StarTech.com MSA Uncoded Compatible QSFP+ Module, 40GBASE-LR4, 40GbE Single Mode SMF Fiber Optic Transceiver, 40GE Gigabit Ethernet QSFP+, LC Connector 10km, 1270nm to 1330nm, DDM, 40Gbps - Lifetime Warranty (QSFP40LR4ST) - QSFP+ transceiver module - 40GbE - 40GBase-LR4 - LC single-mode - up to 10 km - 1270-1330 nm - for P/N: PEX40GQSFDPI, PEX40GQSFPI