Although it shares its name with the earlier MacBook models from yesteryear, the MacBook "Core M" 1.1 12-Inch (Early 2015) and its slightly higher-end brother -- the MacBook "Core M" 1.2 12-Inch (Early 2015) -- are radically different from their predecessors. "Reinvented" for the ultimate in portability, the "Early 2015" MacBook models are even lighter and thinner than the smallest models from the MacBook Air series, and with just one USB-C port for connectivity and a headphone jack, the hardware more resembles an iPad with an attached keyboard than it resembles earlier Apple notebooks. However, like the MacBook Air, these MacBook models run OS X rather than the iPad's iOS. Although these models share their name with the earlier MacBook models from yesteryear, the "Retina" MacBook models are radically different than their predecessors.