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