This Cisco® QSFP-100G-CU4M to Dell® DAC-Q28-100G-4M compatible 100GBase-CU QSFP28 to QSFP28 passive TAA (Trade Acts Agreement) compliant direct attach cable has a maximum reach of 4.0m (13.1ft). It is 100% Cisco® to Dell® compatible and has been programmed, uniquely serialized, and data-traffic and application tested to ensure that it is compliant and functional. This direct attach cable will initialize and perform identically to Cisco® and Dell®'s individual cables and is built to meet or exceed Cisco® and Dell®'s specifications, and comply with MSA (Multi-Source Agreement) standards. We stand behind the quality of our products and proudly offer a limited lifetime warranty.