Cisco QSFP-40G-LR4-S QSFP Plus . 100% compatibility with Cisco QSFP-40G-LR4-S guaranteed - StarTech.com lifetime warranty on all StarTech.com SFP modules - Maximum transfer distance of 10 km (6.2 mi) - QSFP+ (Mini-GBIC) meets or exceeds OEM specifications - QSFP+ transceiver module complies with MSA industry standards - 40GBASE-LR4 fiber transceiver has low power consumption: < 2.5 W - Hot-swappable with other fiber optic modules - Single mode connector - DDM: Yes - MTBF: 1 489 426 hours - Max. Data Transfer Rate: 40 Gbps.