100% compatibility with Cisco QSFP-H40G-CU3M guaranteed - StarTech.com lifetime warranty on all StarTech.com SFP cables - Uses a cost-effective copper cabling alternative to fiber - SFP+ DAC Twinax Cable length is 3 meter (9.8 feet) - SFP+ (Mini-GBIC) cable meets or exceeds OEM specifications - SFP+ direct-attach copper cable complies with MSA industry standards - Passive DAC copper cable has low power consumption: < 0.1 W - Hot-swappable with fiber optic SFP cables and other copper DACs