Later revisions added Intel Core 2 Duo processors and LED-backlit displays. The second-generation model debuted in October 2008 in 13- and 15-inch variants, with a 17-inch variant added in January 2009. Called the "unibody" model because its case was machined from a single piece of aluminum, it had a thinner flush display, a redesigned trackpad whose entire surface consisted of a single clickable button, and a redesigned keyboard.
Updates brought Intel Core i5 and i7 processors and introduced Intel's Thunderbolt. The third-generation MacBook Pro was released in 2012: the 15-inch in June, a 13-inch model in October.
It is thinner than its predecessor, made solid-state storage (SSD) standard, added HDMI, and included a high-resolution Retina display. It eliminated Ethernet and FireWire ports and the optical drive. The fourth-generation MacBook Pro, released in October 2016, adopted USB-C for all data ports and power and included a shallower "butterfly"-mechanism keyboard.
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