The Xbox 360 is the second video game console produced by Microsoft, and the successor to the Xbox. The Xbox 360 competes with Sony's PlayStation 3 and Nintendo's Wii as part of the seventh generation of video game consoles. The Xbox 360 was officially unveiled on MTV on May 12, 2005, with detailed launch and game information divulged later that month at the Electronic Entertainment Expo. Some major features of the Xbox 360 are its integrated Xbox Live service that allows players to compete online, download arcade games, game demos, trailers, TV shows, music and movies and its Windows Media Center multimedia capabilities. Xbox 360 model and features integrated 802.11 b/g/n Wi-Fi, TOSLINK S/PDIF optical audio output, 5 USB 2.0 ports and a special AUX port.
At launch, the Xbox 360 was available in two configurations: the "Xbox 360" package and the "Xbox 360 Core,". Current version Xbox 360 S consoles feature redesigned internal architecture with the Valhalla motherboard, which allows for around 30% more space than previous motherboards and the XCGPU, an integrated CPU/GPU/eDRAM chip using a 45 nm fabrication process. This allows them to be both smaller and quieter than the previous versions of the Xbox 360. They also feature 5 standard USB 2.0 ports and an additional custom USB port for use with peripherals such as the Kinect sensor. Unlike older models, 2.4 GHz 802.11 b/g/n Wi-Fi and a TOSLINK S/PDIF optical audio connector are also built-in, allowing for digital audio and wireless networking without the need for external adapters. The Memory Unit slots found on previous consoles have been removed in favor of the USB flash drive solution added in a previous system software update and the power and DVD drive eject 'buttons' are touch sensitive rather than the physical buttons found on previous models. The external hard disk drive connector has also been swapped for an internal bay for use with a proprietary hard drive. The first Xbox 360 S SKU to be revealed includes a 250 GB hard drive and its casing features a glossy black finish. A second SKU which includes 4 GB of internal flash storage and has matte black casing was released on August 3, 2010 in the US.