All Cisco compatible QSFP28 transceiver modules are certified for functionality, reliability and performance under rigorous testing parameters. Every QSFP28 is RoHS and MSA compliant and built with Tier 1 grade components and lasers. Each Cisco compatible QSFP28 module is individually tested in it's intended application with identical functionality to the OEM product. All ENET QSFP28 modules are backed by an industry-leading lifetime replacement warranty and technical support.