StarTech.com 40GBASE-LR4 QSFP+ Transceiver Module - 40 Gbps - 10 km - MSA Compliant Fiber QSFP+ - QSFP+ transceiver module - 40 Gigabit LAN - 40GBase-LR4 - LC single-mode - up to 6.2 miles - 1270-1330 nm - for P/N: PEX40GQSFDPI/ PEX40GQSFPI