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