StarTech.com Cisco QSFP-40G-SR4-S Compatible QSFP+ Module, 40GBASE-SR4, 40GbE Multimode Fiber MMF Optic Transceiver, 40GE Gigabit Ethernet QSFP+ MPO 100m, 850nm DDM, Cisco Firepower, - Lifetime Warranty (QSFP-40G-SR4-S-ST) - QSFP+ transceiver module (equivalent to: Cisco QSFP-40G-SR4-S) - 40GbE - 40GBASE-SR4 - MPO multi-mode - up to 100 m - 850 nm