StarTech.com Dell EMC QSFP-40G-ESR4 Compatible QSFP+ Module - 40GBase-SR4 Fiber Optical Transceiver (QSFP40GESR4E) - 100% Dell EMC QSFP-40G-ESR4 compatible guaranteed - Lifetime Warranty on all SFP modules - Meets or exceeds OEM specifications - Our SFP modules comply w/ MSA industry standards - Low power consumption - Hot-swappable w/ Multi Mode modules: