StarTech.com Cisco SFP-10G-LR-40 Compatible SFP+ Module, 10GBASE-LR, 10GbE Single Mode (SMF) Fiber SMF Optic Transceiver, 10GE Gigabit Ethernet SFP+ LC 40km, 1310nm, DDM, Cisco Firepower - Lifetime Warranty (SFP-10G-LR-40-ST) - SFP+ transceiver module (equivalent to: Cisco SFP-10G-LR-40) - 10GbE - 10GBase-LR - LC single-mode - up to 40 km - 1310 nm