All DWDM SFP+ 40km compatible optical transceiver modules are certified for functionality, reliability and performance under rigorous testing parameters. Every optical transceiver is RoHS and MSA compliant and built with Tier 1 grade components and lasers. Each DWDM SFP+ 40km compatible fiber optic transceiver is individually tested in it's intended application with identical functionality to the OEM product. All ENET transceivers are backed by an industry-leading lifetime replacement warranty and technical support.