All 400G compatible QSFP-DD transceiver modules are certified for functionality, reliability and performance under rigorous testing parameters. Every QSFP-DD is RoHS and MSA compliant and built with Tier 1 grade components and lasers. Each 400G compatible QSFP-DD module is individually tested in it's intended application with identical functionality to the OEM product. All ENET QSFP-DD modules are backed by an industry-leading lifetime replacement warranty and technical support.