This is a Cisco QSFP-H40G-CU1M compatible 40GBase-CU QSFP+ to QSFP+ direct attach cable that operates over passive copper with a maximum reach of 1.0m (3.3ft). It has been programmed, uniquely serialized, and data-traffic and application tested to ensure it is 100% compliant and functional. Our direct attach cables are built to comply with MSA (Multi-Source Agreement) standards. This direct attach cable is TAA (Trade Agreements Act) compliant. We stand behind the quality of our products and proudly offer a limited lifetime warranty.