StarTech.com MSA Uncoded Compatible QSFP+ Module, 40GBASE-SR4, 40Gbps Multi Mode (MMF) Fiber, 40GE Gigabit Ethernet QSFP+, MPO Connector, 300m, 850nm, 40GbE QSFP Plus Transceiver Module - Lifetime Warranty (QSFP-40G-ESR4-ST) - QSFP+ transceiver module - 40GbE - 40GBASE-SR4 - MPO multi-mode - up to 300 m - 850 nm