SFP+ direct-attach Twinax cable adds reliable 40 GbE connections over copper - StarTech.com lifetime warranty on all StarTech.com SFP cables - SFP+ DAC Twinax Cable length is 0.5 meter (1.6 feet) - SFP+ direct-attach copper cable complies with MSA industry standards - Passive DAC copper cable has lower power consumption is less than 0.1 W - Hot-swappable with fiber optic SFP cables and other copper DACs - Uses a cost-effective copper cabling alternative to fiber optics