StarTech.com 40GBase-SR4 QSFP+ Transceiver QSFP+ Module - MSA Compliant Fiber QSFP+ (QSFP-40G-ESR4-ST) - Adds consistently reliable 40 Gbps connections - Lifetime Warranty on all StarTech.com QSFP+ modules - Our QSFP+ modules comply w/MSA standards - Hot-swappable w/fiber optic modules - SM QSFP+ maximum transfer distance of 300 m (984 ft):