StarTech.com Cisco QSFP-40G-LR4-S Compatible QSFP+ Module, 40GBASE-LR4, 40GbE SMF Optic Transceiver, 40GE Gigabit Ethernet LC Connector, 10km, 1270nm to 1330nm DDM, Cisco Firepower ASR1000

Lifetime Warranty (QSFP40GLR4S) - QSFP+ transceiver module (equivalent to: Cisco QSFP-40G-LR4-S) - 40 Gigabit LAN - 40GBase-LR4 - LC single-mode - up to 10 km - 1270-1330 nm