StarTech.com QSFP-40G-ESR4-ST QSFP+ - 1 x LC 40GBase-SR4 Network - MSA UNCODED Compatible QSFP+ - 40GBASE-SR4 40 Gbps - 40GbE Module - 40GE Gigabit Ethernet QSFP+ 850nm Multi Mode Transceiver - 300 m (984 ft) - MPO Connector - Hot-Swappable & MSA Compliant - Lifetime Warranty