brand new in the box the package was opened. New to Poshmark? If so, use code MAYSAMIR when signing up to receive $10 off your purchase! Thunderbolt technology supports blazing-fast data transfer with two independent channels of 10 Gbps each. Thunderbolt 2 technology can bond the two channels for a superfast 20Gb/s. Compatible Devices MacBook Air (13-inch, Early 2015 - 2017), MacBook Air (11-inch, Early 2015), MacBook Pro (Retina, 13-inch, Late 2012 - 2015), MacBook Pro (Retina, 15-inch, Mid 2012 - 2015), iMac (Retina 4K, 21.5-inch, Late 2015), iMac (Retina 5K, 27-inch, Late 2014 - 2015), Mac mini (Late 2014), Mac Pro (Late 2013)