MacBook. Peter Cohen wrote an article discussing the loss of the FireWire port for Macworld, saying "The absence of FireWire ports is certainly an inconvenience for some users. But it shouldn’t be considered a deal-breaker for most of us, anyway." Technical specifications All are obsolete. Polycarbonate unibody (2009–2012) On October 20, 2009, Apple released a MacBook that introduced a new polycarbonate (plastic) unibody design, faster DDR3 memory, a multi-touch trackpad, an LED-backlit display, and a built-in seven-hour battery. The polycarbonate unibody MacBook, like its aluminum predecessor, lacks FireWire and, like the 13-inch MacBook Pro, has a combined audio in/out port. There is no infrared port and the Apple Remote is not included. On May 18, 2010, the MacBook was refreshed with a faster processor, a faster graphics card, improved battery life, and the ability to pass audio through the Mini DisplayPort connector. On July 20, 2011, the MacBook was discontinued for consumer purchases, but was still available to educational institutions until February 2012. It was the last Mac to use a plastic shell, as every Mac since has used aluminum. Design Unlike the MacBook Air, the MacBook follows the same design first seen in the MacBook Pro; however, it is rounder on the edges than previous laptops in the MacBook line. This model has an all-white fingerprint-resistant glossy palm rest, unlike the grayish surface of its predecessor, and uses a multi-touch glass trackpad like the one found on the MacBook Pro. The video-out port is Mini DisplayPort. The bottom of the MacBook features a rubberized non-slip finish. This was prone to peeling off and Apple offered free replacements fitted by authorised agents until at least 2015 internationally. The built-in battery of the late 2009 revision, a feature introduced earlier in the year with the MacBook Pro, is claimed by Apple to last seven hours compared with five hours in the older models. However, in tests conducted by Macworld, the battery was found to last only about four hours while playing video at full brightness with AirPort turned off. However, Apple's battery life was calculated with the brightness at the middle setting and while browsing websites and editing word documents, not with video and at full brightness. Gizmodo also reached about the same conclusion in their tests, but with AirPort turned on. The battery included in the mid-2010 model holds an additional five watt-hours over the previous model's and is claimed